Abstract
The nowadays hyper-diverse clade of Actinopterygii (ray-finned bony fishes) is characterized by a long evolutionary history and an extremely rich global fossil record. This work builds upon 170 years of research on the fossil record of this clade in Greece. The taxonomy and spatiotemporal distribution of the ray-finned fish record of Greece are critically revisited and placed in an updated systematic and stratigraphic framework, while some new fossil data and interpretations are also provided. Greece hosts diverse ray-finned fish assemblages, which range in age from Lower Jurassic to Quaternary. Most known assemblages are of Miocene–Pliocene age and of marine affinities. A minimum of 32 families, followed by at least 34 genera and 22 species, have been recognized in Greece. From originally two named genera and seven species, only two fossil species, established on Greek material, are accepted as valid. Additional taxonomic diversity is anticipated, pending detailed investigations. From a taxonomic perspective, previous knowledge lies on preliminary or authoritative assessments of fossils, with many decades-old treatments needing revision. Little is known about Mesozoic–early Cenozoic occurrences or freshwater assemblages. Given the proven potential of the Greek fossil record, this chapter stresses the need for additional exploration and the establishment of permanent, curated collections of fossil fishes in Greek institutions. Directions for future research are discussed.
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Keywords
- Actinopterygii
- Neopterygii
- Teleostei
- Marine environment
- Brackish and freshwater environment
- Neogene
- Miocene
- Pliocene
1 Introduction
A continuously thickening count of over 33,000 living species, already surpassing that of all other vertebrate species combined, renders Actinopterygii (ray-finned bony fishes) the most diverse clade of vertebrate animals (Nelson et al. 2016; Eschmeyer and Fong 2019). This vast taxonomic richness is coupled with an astounding array of anatomical, feeding, reproductive, locomotory, and other biological specializations, which enabled ray-fins to conquer most aquatic niches on the planet (from abyssal plains to hypersaline volcanic lakes), and to even glide, or crawl, outside the aquatic medium (Helfman et al. 2009; Nelson et al. 2016; Froese and Pauly 2019).
Actinopterygian origins date back to at least the late Silurian (~425 Ma), as inferred by the age of the first fossils of their sarcopterygian sister group (Zhu et al. 2009). The oldest definitive actinopterygian fossils are dated in the Early and Middle Devonian (Giles et al. 2015; Lu et al. 2016). Similarly, all major living actinopterygian lineages (Cladistia; Chondrostei; Neopterygii) are widely thought to have diverged in the Paleozoic (Near et al. 2012; Broughton et al. 2013; Sallan 2014; Betancur-R et al. 2015; Friedman 2015), but their first accepted occurrences are in early and middle Mesozoic rocks (Olsen 1984; Hilton and Forey 2009; Giles et al. 2017). The current taxonomic dominance of actinopterygians relative to other aquatic vertebrates was foreshadowed by their impressive Triassic radiation(s), in the aftermath of the catastrophic Permian-Triassic extinction (~251 Ma; Friedman and Sallan 2012; Romano et al. 2016), and the appearance of Telostei in the Middle Triassic (total group: Tintori et al. 2015; Arratia 2017). The Cretaceous–Paleogene Extinction (K/Pg) led to the complete eradication or decimation of several long-lasting Mesozoic actinopterygian lineages, especially in marine waters (Friedman 2009; Friedman and Sallan 2012; Guinot and Cavin 2016). Paleogene and younger radiations in the newly emptied ecological spaces marked the beginning of a new era in the evolutionary history of the clade, in which Teleostei, largely represented by members of the ostariophysan (mostly in freshwaters) and acanthomorph (spiny-rayed fishes) super-radiations, are established as dominant vertebrate components of global aquatic niches (Alfaro et al. 2009, 2018; Sibert and Norris 2015).
The long evolutionary history of ray-finned fishes is evidenced by a particularly rich fossil record. Stratified aquatic deposits can yield large numbers of articulated, yet flattened individuals (for some examples from Greece, see Gaudant 2001, 2004). Laminated rocks, corresponding to rapid deposition and low energy and low bottom oxygenation environments, can sometimes allow the preservation of very delicate structures, such as gut contents, embryos, or even soft tissues and pigments (e.g., Viohl 1990; Vinther 2015; Argyriou et al. 2016; Maxwell et al. 2017), allowing for painting a more vivid picture of past ecosystems and biotic interactions within them, while providing important insights into the evolution of key anatomical structures and biological specializations. Three-dimensional anatomical structure is only rarely preserved in fossil actinopterygians, but such fossils can allow the study of structures that are lost in flattened individuals (e.g., braincases, sensory endocasts, gill skeletons), and are of tremendous value to paleontologists, especially in light of modern fossil imaging and investigation techniques (Friedman et al. 2015; Argyriou et al. 2018). Equally important biological and geological information often derives from studies of identifiable ichthyoliths (isolated bones, scales and teeth, Bellas et al. 1998; Argyriou et al. 2015; Vasileiadou et al. 2017) and otoliths, (e.g., Agiadi et al. 2013, 2019; Agiadi this volume). Due to their exquisite fossil record, actinopterygians constitute an excellent means for studying the evolution of aquatic life on the planet, and its response to major biotic crises and extinctions (Friedman and Sallan 2012; Guinot and Cavin 2016; Romano et al. 2016). At the same time, the largely ectothermic traits, in conjunction with the strict environmental and habitat preferences of most ray-fins (e.g., Helfman et al. 2009), establish their fossil record as a powerful tool for making paleoenvironmental and paleobiogeographical inferences (Gaudant 2002; Landini and Sorbini 2005a; Argyriou et al. 2015; Carnevale et al. 2018), often through the scope of isotope geochemistry (e.g., Otero et al. 2011).
Historically, the study of fossil actinopterygians has been associated with several challenges, chief of which is the sheer richness of actinopterygian biodiversity and fossil record, which encompasses numerous groups of tens or hundreds of millions of years of divergent evolutionary histories (Friedman and Sallan 2012; Near et al. 2012; Broughton et al. 2013; Betancur-R et al. 2015; Friedman 2015; Nelson et al. 2016). As a result, commonly used synapomorphies for many clades of ray-fins—mostly teleosts—are established on modern taxa alone, and their validity has not been questioned by large-scale phylogenetic analyses (see, e.g., Wiley and Johnson 2010). Placing early diverging fossil taxa without closely related modern representatives on the tree of life is an extremely difficult task and constitutes a frontier in current paleoichthyology (Sallan 2014; Friedman 2015; Giles et al. 2017; Argyriou et al. 2018). Even when modern-looking forms are examined, their study usually requires consultation of extensive comparative materials in collections. Often limited anatomical information coming from two-dimensionally flattened fossils, as well as prevalent issues related to structural homology—mostly encountered when examining deeply nested forms (Schultze 2008)—pose additional obstacles for deciphering the fossil record and history of the clade.
Fossil actinopterygians form an extremely important, but historically overlooked, component of Greek vertebrate paleontological research. This synthesis aims at bringing together available information on the rich record of body fossils of the clade in Greece and critically assessing historical attributions in terms of validity and reliability—at least according to the opinion of the author, and based on a critical review of the literature. By placing all relevant occurrences in an up-to-date systematic, geographic, and stratigraphic context, it is anticipated that this chapter will fuel future paleo-ichthyological research in Greece.
2 Historical Overview and Collection Information
Actinopterygians from the Miocene of Kymi, Euboea, were the first to attract scientific attention on fishes from Greece, during the 1800s (de Waldheim 1838, 1850; Valenciennes 1861; Gaudry 1862; Unger 1867), but these early authoritative—rather than synapomorphy-based—taxonomic assessments are in need of revision, especially since they are not accompanied by adequate figures of the material. Fossil cyprinodontids were discovered in the Messinian of Crete by Raulin (1861) and were later revisited by Woodward (1901). In the same work, Woodward updated the taxonomic status of fossil percomorphs from Kymi, first described by de Waldheim (1838, 1850), on the basis of material in the collections of what is nowadays the Natural History Museum of London (but see Centropomidae section below). After a four-decade hiatus, Weiler described a fossil clupeid from the Miocene of Serres Basin (Weiler 1943).
The second half of the twentieth century saw an increase in interest in the study of Greek ray-fin fossil record. Kottek described some fragmentary leptolepid remains from the Toarcian (Early Jurassic) of Leukada, which derive from a since unexplored, and allegedly rich fossil fish bonebed near the village of Anavryssada (Kottek 1964). This represents the stratigraphically oldest occurrence of fossil ray-fins in Greece known to date. Melentis was the first Greek paleontologist to publish on fossil actinopterygians (Melentis 1967a, b). Unfortunately, his accounts of a †pycnodontid from the Cenomanian (Late Cretaceous) of Lindos, Rhodos, should be treated with extreme caution (see †Pycnodontidae section below). Important, but largely overlooked and preliminary taxonomic lists and figures of Late Cretaceous–Paleogene actinopterygians from Eurytania, have been provided in a stratigraphic monograph by Koch and Nikolaus (1969).
Symeonidis and Bachmayer set the stage for later work on the diverse Neogene marine ichthyofaunas of Crete (Symeonidis 1969; Bachmayer and Symeonidis 1978; Bachmayer et al. 1984). Their taxonomic results in the case of the so-called †Mene psarianosi (= †Alectis psarianosi) and their newly erected syngnathiform species have been since revised (Bannikov 1987; Bürgin 1994; Gaudant 2001, 2004). Müller and Strauch (1994) also provided a short account of a fossil assemblage from the Pliocene of Prassas, Crete, which was subsequently revised (Gaudant 2001). Another interesting assemblage, containing both articulated skeletons, ichthyoliths and otoliths from the Messinian of Karpathos, was presented by Bellas et al. (Bellas et al. 1998). The bulk of research on Neogene marine actinopterygians was led by Gaudant between the late 1970s and the early 2010s. These works expanded on the alpha-taxonomic status and paleoenvironmental implications of fossils from Aegina (Gaudant et al. 2010b), Attiki (Gaudant and Symeonidis 1995), Crete (Gaudant 1979, 1980, 2001, 2004, 2014b; Gaudant et al. 1994, 1997a) and Gavdos Island (Gaudant et al. 2005, 2006), highlighted the richness and potential of the Miocene–Pliocene actinopterygian archive of Greece, and also contributed data for downstream analyses of Mediterranean actinopterygian diversity changes during the latter part of the Cenozoic (Gaudant 2002; Landini and Sorbini 2005a). Yet, detailed descriptions of Neogene actinopterygians from Greece and their systematic treatment are still lacking for the most part.
Few treatments of the Greek record of ray-fins have been published in the past two decades. Careful anatomical and systematic work on Tortonian (Přikryl and Carnevale 2017) and Pliocene (Sorbini and Tyler 2004) actinopterygians from Crete revealed the presence of new fossil species, indicating that actinopterygian diversity and taxonomy in the Neogene of Crete, and conceivably elsewhere in Greece, remain underappreciated. The study of Maastrichtian actinopterygians from Gavdos Island represents the first recent attempt to investigate the pre-Cenozoic fossil record of actinopterygians of the country (Cavin et al. 2012). The first investigation of microscopic ichthyoliths from Greek freshwater deposits (early Miocene, Lesvos Island) was only published a few years ago (Vasileiadou et al. 2017). Furthermore, a recently completed MSc. thesis has shed light on the late Miocene freshwater–brackish clupeids of Aidonochori, Serres Basin, Northern Greece (Kevrekidis 2016). Finally, a new study dealing with the Maastrichtian–Paleogene actinopterygian assemblages from Eurytania has been made available while this work was in press (Argyriou and Davesne 2021).
Over 170 years of research have contributed significantly toward creating a framework for the temporal, stratigraphic, and geographical distribution of fossil ray-fins in Greece, while also providing taxonomic assessments of relevant assemblages. At the same time, past research efforts have been sporadic and/or have largely concluded at a preliminary level, without tapping the potential informativeness of this rich record for a variety of subjects. These include the evolutionary histories and paleobiogeography of Eastern Mediterranean marine and freshwater faunas, or the study of major events, such as the K/Pg Extinction and the Messinian Salinity Crisis. Unlike late Cenozoic mammals (see relevant chapters in this volume), research on the actinopterygian record of Greece has not received enough scientific attention and is still in its infancy (but see otoliths in Agiadi this volume). Detailed descriptions of Greek fossils are largely wanting, and older taxonomic assessments are in dire need of revision, posing obstacles for further analytical work. This is further exacerbated by the lack of organized collections of fossil fishes and recent comparative material in Greek institutions. A rudimentary-only collection of Cretaceous–Pliocene fossil fishes is housed at the AMPG (organized by the author and S. Roussiakis). Additionally, numerous teleostean skeletons from several Neogene localities of Crete (mainly Bregmaceros and Spratelloides from the Heraklion Basin) form part of the collections of the Natural History Museum of Crete. By contrast, rich collections from the Cretan Neogene are housed in the Natural History Museum of Vienna (Gaudant 2001, 2004). Some few findings from the Miocene of Kymi, Euboea (Gaudry 1862; T.A. personal observations and communication with Giorgio Carnevale) and the Zanclean of Aegina Island (Gaudant et al. 2010b) are housed in the MNHN, Paris, while additional fossils from the Miocene of Crete and possibly Kymi are housed in the Natural History Museum of London (Woodward 1901).
3 Phylogenetic Relationships
Actinopterygians are widely accepted as a monophyletic group, despite owing their name to their rayed fins, which are also present in sarcopterygians (Friedman 2015). Combinations of hard-tissue synapomorphies [(i) absence of jugal canal; (ii) presence of median aortic canal in the occiput; (iii) absence of endoskeletal basal plates of dorsal and anal fins; (iv) narrow interorbital septum; (v) lateral cranial canal; (vi) posteriorly expanded supratemporals; (vii) acrodin caps on teeth; (viii) fenestrated metapterygoidean portion of palatoquadrate; (ix) perforate propterygium embraced by fin rays; (x) presence of ganoine] are employed to distinguish Paleozoic actinopterygians from other osteichthyes, though, naturally, distinguishing lines dim when examining deeply nested taxa (Friedman 2015; Giles et al. 2015; Lu et al. 2016).
The relationships among actinopterygians—neopterygians and teleosts in particular—had been a matter of controversy (e.g., see Patterson 1973 vs. Grande 2010, for the status of Holostei; Patterson and Rosen 1977 vs. Arratia 1997, for identifying the deepest branch of crown group Teleostei; or Davesne et al. 2016 for a summary of the complicated history of acanthomorph interrelationships) before the establishment of reliable molecular systematic methodologies (Near et al. 2012, 2013; Betancur-R et al. 2015; Hughes et al. 2018). More recent morphology-based investigations are slowly bridging the gap between molecular and morphological phylogenetic hypotheses (e.g., Grande 2010; Davesne et al. 2016). It is now accepted that extant Actinopterygii are distributed across three major lineages of inferred Paleozoic origins: the basally diverging Cladistia (ropefish and bichirs); Chondrostei (sturgeons and paddlefish); and Neopterygii, with the latter including the nowadays depauperate Holostei (gars and bowfin) and the overabundant Teleostei (Near et al. 2012; Betancur-R et al. 2015, 2017; Nelson et al. 2016; Hughes et al. 2018). The relationships of the major groups of ray-finned fishes found in Greece are shown in Fig. 1.
Teleostei account for ~99% of living actinopterygian species and are strongly supported as monophyletic by both morphological and molecular data (Near et al. 2012; Betancur-R et al. 2013, 2015; Broughton et al. 2013; Arratia 2017; López-Arbarello and Sferco 2018). Numerous hard-tissue synapomorphies support teleost monophyly, including: (i) orbital region of skull narrower than postorbital; (ii) presence of one suborbital bone between the posterodorsal margin of the infraorbital series and the opercular apparatus; (iii) presence of two supramaxillae; (iv) lower jaw articulation located ventral to the posterior margin of the orbit; (v) articular fused with angular and retroarticular; (vi) notch on ascending margin of dentary; (vii) coronoid process formed by angular and dentary; (viii) lateral ridge on dentary separating dental and splenial portions of lower jaw; (ix) long epineural processes; (x) presence of 20–26 principal rays; (xi) presence of an enlarged dorsal scute preceding caudal fin (sensu Arratia 2017).
Apart from one problematic occurrence of a Cenomanian †pycnodontid in Rhodos Island (Melentis 1967a, b), the Greek actinopterygian archive is exclusively populated by teleosts (Appendix). †Leptolepid remains from the Toarcian of Leukada (Kottek 1964) represent the only ascertained stem teleost occurrence in Greece while all remaining occurrences correspond to members of crown group lineages. Reliably documented Mesozoic actinopterygians from Greece have been ascribed to extinct families (e.g., †Dercetidae, †Enchodontidae; see Koch and Nikolaus 1969; Cavin et al. 2012), whereas Cenozoic fossils have been predictably included in extant taxa (families, genera, and in some cases to the species-level; see Appendix) on the basis of broad morphological and meristic similarities. The phylogenetic affinities of Greek actinopterygian fossils have not yet been explored, to the exclusion of Enchodus cf. dirus from the Maastrichtian of Gavdos Island (Cavin et al. 2012).
4 Distribution in Greece and Nature of Deposits
As noted above, ray-finned fishes, and teleosts in particular, are expected to have gradually expanded their occupation of most aquatic ecological niches on the planet, especially after the Paleozoic (Friedman and Sallan 2012). They are thus expected to be present in sedimentary rocks that were deposited in a large spectrum of paleoenvironments, ranging from offshore and deep marine waters, to fluvial, or lacustrine freshwaters. However, freshwater deposits (and included fossils) are more difficult to be preserved in the geological record, due to their relative ephemerality and patchiness. It is thus unsurprising that the vast majority of fossil ray-fins in Greece come from marine deposits. To paint a more complete picture of the Greek fossil record, locality information mined from gray literature (e.g., conference, abstracts field guides, and unpublished theses), stratigraphic and sedimentological works from the 1970s to the 2010s, or deriving from personal observations of the author and communication with colleagues is also taken into account. A brief summary of fossiliferous localities, ages, and paleoenvironments is given below, and more extensively in the Appendix; these lists might not be exhaustive.
Marine Occurrences
At least 33 indisputably marine, or likely marine localities have been recognized in Greece, although not all have been subjected to proper collecting and study (Fig. 2). The marine actinopterygian record of Greece begins with some poorly preserved †leptolepids from the Toarcian of the Ionian Unit, Leukada Island (Kottek 1964). Other published Mesozoic occurrences are restricted to the Cenomanian of Lindos, Rhodos Island (Melentis 1967a, b), and the terminal Maastrichtian of Pindos Unit, in Eurytania (Koch and Nikolaus 1969; Argyriou and Davesne 2021) and Gavdos Island (Cavin et al. 2012). Unpublished teleost remains are also present in Late Cretaceous exposures of Pindos Unit in Northern and central Peloponnese (T.A. personal observations and personal communication with E. Koskeridou, G. Theodorou and K. Trikolas).
The Cenozoic record of Greece is very rich, but is largely skewed toward the late Miocene and Pliocene. The oldest reported Cenozoic occurrences come from flysch deposits of the Pindos Unit in Eurytania and are dated as Paleocene–early Eocene (Koch and Nikolaus 1969; Argyriou and Davesne 2021). Rich Tortonian marine assemblages can be found in the vicinity of Ierapetra and possibly Heraklion, Crete (Symeonidis 1969; Gaudant et al. 1997a; Gaudant 2004), and Gavdos Island (Gaudant et al. 2005), while a fish-bearing, bituminous horizon in Keri, Zakynthos has been identified, but not yet studied (Dermitzakis 1979; T.A. personal observations). Messinian fossiliferous deposits predating the Messinian Salinity Crisis are widespread in Crete, Gavdos (Gaudant 1980; Gaudant et al. 1997b, 2006) and Karpathos (Bellas et al. 1998), but only one poorly studied horizon is known in continental Greece, in Acropotamos, Kavala (Dermitzakis et al. 1986). Teleost teeth broadly ascribed to the late Miocene are also present in Kefalonia (pers. obs. on AMPG material; S. Roussiakis pers. comm.). The most notable early Pliocene occurrences come from the diatomitic horizons of Aegina Island, but despite their potential informativeness regarding the state of the Mediterranean in the immediate aftermath of the MSC, they remain understudied (Gaudant et al. 2010b; Argyriou and Theodorou 2011). The late Pliocene of Heraklion Basin, Crete, hosts exceptionally preserved and diverse ichthyofaunas (Gaudant et al. 1994; Gaudant 2001). Additional Pliocene occurrences have been reported in Rethymno, Chania, and Attiki regions (Gaudant and Symeonidis 1995; Gaudant 2001; Sorbini and Tyler 2004). Late Pliocene and Pleistocene fossiliferous horizons situated in Milos and Rhodos wait to be sampled and studied (Cornée et al. 2006; Calvo et al. 2012). Finally, wooden crates containing what appear to be unstudied marine teleost fossils from the Neogene are hosted in the collections of the AMPG (T.A. personal observations). Some of these fossils are wrapped in newspapers that treat the Russo-Japanese war of 1904–1905 as current news, but no locality or collection information has been retrieved so far.
Freshwater and Brackish Occurrences
Approximately six freshwater, and five brackish or potentially brackish occurrences have been reported. Burdigalian ichthyoliths from Lapsarna, Lesvos (Vasileiadou et al. 2017), and the early Miocene of SE Chios (Reichenbacher and Böhme 2004) constitute the oldest known freshwater fish assemblages in Greece. Ray-fin remains have been reported from the Messinian of Metochi, Serres (Georgalis et al. 2017); the Messinian–Zanclean of Florina-Ptolemais-Servia (Hordijk and de Bruijn 2009); and the Pleistocene of Marathousa, Megalopolis (Panagopoulou et al. 2018), but have not yet been studied.
The understudied assemblages from Kymi, Euboea, are tentatively dated as early Miocene, and tentatively interpreted as brackish, based on the supposed euryhaline affinities of recognized taxa (de Waldheim 1838, 1850; Gaudry 1862; Unger 1867; Woodward 1901; Kottis et al. 2002). Occurrences of †Aphanius crassicaudus in gypsiferous evaporitic deposits in Neo Khorio, Voukolies, and Kallergiana, Crete, have been identified as brackish and concurrent with the peak of the Messinian Salinity Crisis and the supposed desiccation of the Mediterranean in the late Messinian (Freuenthal 1969; Gaudant 1979, 2014b). However, there is evidence of primarily marine clupeids in the same beds, complicating this narrative (Gaudant 1980). The Pliocene clupeids from Serres Basin (Weiler 1943), and unidentified Plio-Pleistocene ray-fins from Vatera, Lesbos (Drinia et al. 2002), might also correspond to brackish, or freshwater deposits. New information on fresh or brackish waters of Greece is coming from the ongoing study of fossil clupeids from Aidonochori, Serres Basin (Kevrekidis 2016). Another possible addition to this list is the middle Pleistocene of Pigadia Basin in Karpathos Island. There, a vertebra possibly belonging to an ostariophysan—a group commonly found in freshwaters—has been found (Bellas et al. 1998).
5 Systematic Paleontology
Due to the taxonomic and phylogenetic breadth covered in this chapter, this section is organized in monophyletic (when possible) families. Synapomorphies for each family are not given, as this lies beyond the scope of this work. Instead, the reader is referred to Wiley and Johnson (2010), Nelson et al. (2016), and Betancur-R et al. (2017) for basic information on morphological synapomorphies and redirection to specialized literature. Taxonomic ranks superior to the genus level are unnamed, since they are obsolete in a modern phylogenetic context. Information on naming authorities and type genera and species is largely based on Wiley and Johnson (2010) and Eschmeyer and Fong (2019). The order of families and classification are based on the scheme proposed by Betancur-R et al. (2017), with fossil families being included according to their widely accepted position (see caption of Fig. 1). References regarding naming authorities, which are not also cited in the running text are not given in the reference list due to space constrains. Throughout the text and figures, extinct taxa are preceded by the dagger symbol ‘†’, following Patterson and Rosen (1977). Fossils that were not properly described and/or figured, or the geological context of which is problematic are only listed in the Appendix.
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Actinopterygii sensu Goodrich, 1930
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Neopterygii Regan, 1923
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†Pycnodontiformes Berg, 1937
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†Pycnodontidae Agassiz, 1833
Type Genus
†Pycnodus Agassiz, 1833.
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† Coelodus Heckel 1854
Type Species
†Coelodus saturnus Heckel, 1854.
Nomenclatural and Taxonomical History
Initially described as †Coelodus muensteri (Melentis 1967a, b; Fig. 3a), but the specific attribution was subsequently challenged and removed (Schultz et al. 1997).
Distribution
In Greece, this taxon is known only from the Cenomanian of Lindos, Rhodos (Melentis 1967a, b). Outside Greece, this taxon has been reported from Europe and the Americas, but only its European occurrences have been revised. The latter include the Upper Jurassic–Cenomanian of UK and continental Europe, including the Balkans as well (Schultz et al. 1997).
Comments
This is a problematic occurrence, as the original locality and lithological context are conjecturally established. Prior to its study (Melentis 1967a, b), the †pycnodontid in question was part of the private collection of a cleric, who had in turn bought it from a fossil vendor, as evidenced by the transaction receipt that accompanies the specimen in the collections of the AMPG (S. Roussiakis pers. comm.; Fig. 3b). The fossiliferous facies that might have produced this fossil have not been since identified and explored for additional vertebrate remains. Therefore, the possibility that this specimen was not originally found in Rhodos, or even Greece, cannot be fully ruled out.
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Teleostei Müller, 1846 (sensu Arratia 2017 )
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†Leptolepididae Pictet, 1851
Type Genus
†Leptolepis Agassiz, 1832.
Nomenclatural and Taxonomical History
†Leptolepididae has a complicated taxonomic history and has been previously treated as a grade-like assemblage of primitive teleosts (Nybelin 1974; Arratia 1999, 2017; Arratia and Hikuroa 2010; Konwert and Stumpf 2017).
Distribution
In Greece, this taxon is known from the Toarcian of the Ionian Unit, and particular from Aghios Ilias, Anavryssada, Lefkada Island (Kottek 1964). Outside Greece, †Leptolepididae s.l. appeared in the Early Jurassic of Western and Central Europe and seem to have had achieved a cosmopolitan distribution by the Middle Jurassic (Arratia and Hikuroa 2010; Konwert and Stumpf 2017).
Comments
A partial maxilla and associated dentalosplenial of a †leptolepidid-like actinopterygian have been found in the Toarcian of Aghios Ilias (Anavryssada exposure), Lefkada, and have been identified as †Leptolepis cf. coryphaenoides (Kottek 1964). The material resembles †Leptolepis, but lacks any synapomorphies of the genus (Arratia 2017; Konwert and Stumpf 2017). This occurrence corresponds to the oldest record of actinopterygians in Greece, but should be treated as cf. †Leptolepididae indet. until more complete material becomes available.
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† Ichthyodectiformes Bardack and Springle, 1969
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†Ichthyodectoidei Romer, 1966
Distribution
In Greece, †Ichthyodectoidei have only been reported from the Maastrichtian (Late Cretaceous) of the Pindos Unit, Gavdos Island (Cavin et al. 2012). Outside Greece, †Ichthyodectiformes are found in Bathonian (Middle Jurassic)–Maastrichtian (Late Cretaceous) marine, and, rarely, in brackish and freshwater deposits of all continents (Arratia et al. 2004; Cavin et al. 2013).
Comments
This occurrence is based on a partially preserved postcranium from the Maastrichtian of Gavdos, which exhibits aspects of the caudal part of the vertebral column and associated dorsal, anal and caudal fins (Cavin et al. 2012). Similarities of the Gavdos specimen with †Saurodon elongatus from the Maastrichtian of Nardó, Italy, have been noted, but the specimen was left in open nomenclature due to its incomplete preservation (Cavin et al. 2012).
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Clupeiformes Bleeker, 1859
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Clupeidae Cuvier, 1817
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Alosa Linck, 790
Type Species
Alosa alosa (Linnaeus, 1758).
Included Taxa
†Alosa crassa (Sauvage, 1873); Alosa tanaica (Grim, 1901); †Alosa elongata Agassiz, 1843.
Nomenclatural and Taxonomical History
†Alosa crassa is often included in the extant genus Sardina Antipa 1904, as †Sardina crassa, or †Sardina cf. crassa (Dermitzakis et al. 1986; Gaudant 2004, 2014b; Gaudant et al. 2005). The original generic attribution Alosa is herein maintained, following Grande (1985) and Carnevale (2007).
Distribution
In Greece, marine occurrences of †Alosa cf. crassa, or Alossa sp. are known from the Tortonian of the Makrilia Formation, in the vicinity of Ierapetra, Crete, the Messinian and Pliocene of Crete and the Tortonian–Messinian of Gavdos Island. Alosa elongata has been signaled in the Pliocene of Heraklion basin, in Crete. A. tanaica (first described as Caspialoassa nordmanni is known from the Pliocene of Strymonas valley in Serres (see Appendix for detailed information). Outside Greece, fossils affiliated with †Alosa crassa are common in the Meditteranean Neogene, with records in Algeria, Spain, Italy, and Cyprus (Sauvage 1873; Arambourg 1925, 1927; Gaudant et al. 2000, 2015; Landini and Sorbini 2005a; Carnevale 2007; Gaudant 2008a, b). Also, †Alosa elongata is known from the late Miocene of Algeria, Spain, Italy (Arambourg 1927; Landini and Sorbini 2005a; Gaudant 2008b; Gaudant et al. 2008, 2010a). Fossils attributed to A. tanaica have been reported from the Paratethyan Miocene (Paucǎ 1931; Rückert-Ülkümen 1994; Schwarzhans et al. 2017.
Comments
Most of the attributions to Alosa sp. refer to isolated scales, or bones of larger sized clupeids. The alosin from the Pliocene of Serres Basin, was originally attributed to Caspialosa nordmanni (Antipa 1904; Weiler 1943), which is considered a junior synonym of the Black Sea species A. tanaica (Grim 1901). This species is often mentioned as A. nordmanni (Schwarzhans et al. 2017) and, adding to the confusion, some of the contained fossils have been moved to †Alosa pinarhisariensis (Rückert-Ülkümen 1994). The specific attribution of the Serres alosin is ambiguous at best. However, future studies on newly discovered fossils from the late Miocene of Aidonochori, Serres Basin, might help shed some light on the complicated systematics of freshwater–brackish clupeids from the area (Kevrekidis 2016).
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Sardina Antipa, 1904
Type Species
Sardina pilchardus (Walbaum, 1792). Only included species.
Distribution
In Greece, this taxon is known from the Pliocene of Heraklion Basin and Rethymno, Crete (see Appendix). Outside Greece, Sardina fossils are known from the Pliocene and Pleistocene of Italy (Landini and Sorbini 2005a). S. pilchardus is present in the Western Atlantic, the Mediterranean, and the Black and Azov seas (Froese and Pauly 2019).
Comments
Many of the Sardina sp., or Sardina? sp. occurrences in Greece correspond to poorly preserved, and/or disarticulated material, and might show taxonomic overlap with Alosa spp.
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Spratelloides Bleeker, 1851
Type Species
Clupea argyrotaeniata (Bleeker, 1849) [= junior synonym of Spratelloides gracilis (Temminck and Schlegel, 1846)].
Included Taxa
S. gracilis (Temminck and Schlegel, 1846).
Distribution
In Greece, this taxon is known from the Tortonian of the Makrilia Formation, vicinity of Ierapetra, Crete, the Zanclean of Aegina Island, the Pliocene of Attiki, the Pliocene of Heraklion Basin and Rethymno, in Crete (Appendix and Fig. 4). Outside Greece, fossils affiliated with S. gracilis are known from the late Miocene, Pliocene and early Pleistocene of Algeria, Spain, and Italy (Arambourg 1927; Gaudant 2002, 2008b; Landini and Sorbini 2005a; Carnevale et al. 2006; Gaudant et al. 2015). Nowadays, S. gracilis is present in tropical waters of the Indo-Pacific Realm (Froese and Pauly 2019).
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Cypriniformes Bleeker, 1859
-
Cyprinidae Cuvier, 1817
Type Genus
Cyprinus Linnaeus, 1758.
-
† Palaeoleuciscus Obrhelová, 1967
Type Species
†Palaeoleuciscus chartaceus (Laube, 1905).
Distribution
In Greece, this taxon is known only from the early Miocene of Lapsarna Locality, Lesvos Island, Greece (Vasileiadou et al. 2017; Appendix). Outside Greece, its oldest fossils come from the Oligocene of Germany and Switzerland (Cavender 1991; Böhme and Ilg 2003). Τhere numerous records of tooth and skeletal remains of the genus in the Miocene of Europe and Anatolia as well (e.g., Cavender 1991; Böhme and Ilg 2003; Rückert-Ülkümen and Yiğitbaş 2007; Böhme 2010; Gaudant 2014a, 2015).
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Barbus Cuvier and Cloquet, 1816
Type Species
Barbus barbus (Linnaeus, 1758).
Distribution
In Greece, this taxon is only known from the early Miocene of Lapsarna Locality, Lesvos Island, Greece (Vasileiadou et al. 2017; Appendix). Outside Greece, Barbus-like (?Barbus sp.) pharyngeal teeth first appear in the Oligocene of Afroarabia (Otero and Gayet 2001). Barbus remains are quite common in Neogene and younger freshwater deposits in Europe, Africa, the Arabian subcontinent, and Anatolia (Cavender 1991; Stewart 2001, 2003; Böhme and Ilg 2003; Přikryl et al. 2016b; Stewart and Murray 2017). The distribution of modern Barbus s.s. species ranges from Europe to the Caspian Sea, Anatolia, and Tigris and Euphrates drainages, with approx. 13 species found in Greek freshwaters (Froese and Pauly 2019).
Comments
It is widely accepted that modern and fossil species lumped under the genus Barbus correspond to different lineages, rendering the genus paraphyletic (Berrebi and Tsigenopoulos 2003; Kottelat and Freyhof 2007). Barbus s.l. is used to indicate uncertainty relative to the placement of fossils relative to modern lineages, whereas Barbus s.s. indicates affinities with the European and Anatolian subgenus Barbus. Isolated pharyngeal teeth or bones are difficult to attribute to specific lineages, yet similarities of the Lapsarna Barbus with Barbus s.s. have been noted (Vasileiadou et al. 2017).
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Cyprinion Heckel, 1843
Type Species
Cyprinion macrostomus Heckel, 1843.
Distribution
In Greece, pharyngeal bones and teeth of Cyprinion have been found in the early Miocene of Lapsarna Locality, Lesvos Island, Greece (Vasileiadou et al. 2017; Appendix). Outside Greece, pharyngeal teeth putatively attributed to the genus have also been found in the early Miocene of Turkey (Böhme and Ilg 2003). Modern representatives of Cyprinion have a distribution that ranges from the Arabian subcontinent to Myanmar (Froese and Pauly 2019).
Comments
According to Vasileiadou et al. (2017), the Lapsarna material likely represents a new species, which has not yet been described formally.
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Aulopiformes Rosen, 1973
-
†Dercetidae Woodward, 1901
Type Species
†Dercetis scutatus (Agassiz, 1834).
Distribution
In Greece, fossils of †Dercetidae are so far known from the Late Maastrichtian of Pindos Unit, in the vicinity of Karpenisi, Eurytania (Koch and Nikolaus 1969). Outside Greece, †dercetids are known from the Late Cretaceous–Paleocene of Europe, the Middle East, North and Central Africa, and South America (summarized in da Silva and Gallo 2011, 2016; Vernygora et al. 2018).
Comments
The †dercetids found in the vicinity of Karpenisi have been tentatively ascribed to either the aulopiform †Rhynchodercetis or, erroneously, the stem teleost †Belonostomus (Koch and Nikolaus 1969). Only one †dercetid-like elongate lower jaw, bearing numerous minute teeth, has been figured, but this material has not been described or treated systematically (Koch and Nikolaus 1969, Table 33:3), and bears no apomorphies to support any attribution below the Family-level. No repository information has been provided for these fossils.
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†Enchodontidae Woodward, 1901
Type Genus
†Enchodus Agassiz, 1835.
-
† Enchodus Agassiz, 1835
Type Species
†Enchodus lewesiensis (Mantell, 1822).
Distribution
In Greece, fossils of †Enchodus cf. dirus are known from the late Maastrichtian, Pindos Unit, Gavdos Island (Cavin et al. 2012). Additional †enchodontid remains, possibly referable to †Enchodus, have been collected from Maastrichtian deposits of the Pindos Unit, exposed on the road from Aghia Triada to Domniani, near Karpenisi, Eurytania (Koch and Nikolaus 1969). Outside Greece, the oldest disarticulated remains referred to †Enchodus sp. have been collected in the Early Cretaceous of Spain (Kriwet 2003), while articulated remains are known from the Albian–Cenomanian of Mexico (Fielitz and González-Rodríguez 2010). This genus achieved a cosmopolitan distribution during the Late Cretaceous, with occurrences in North and South America, England and western continental Europe, Africa, India, and the Middle East (summarized in Goody 1969; Chalifa 1996; Cavin et al. 2012; da Silva and Gallo 2016; Holloway et al. 2017).
Comments
A relatively well-preserved skull of †Enchodus, also exhibiting features of the palate and jaws, was found in the late Maastrichtian deposits of Gavdos Island and was attributed to a juvenile individual (Cavin et al. 2012). The specimen was included in a phylogenetic analysis alongside other †enchodontids, and was resolved as sister taxon to †Enchodus dirus (Cavin et al. 2012), which, in turn, is found in several Late Cretaceous localities of the Western Interior Seaway, North America (Goody 1969). The Gavdos and North American specimens seem to only differ in size and ornamentation, and their seemingly close relationship supports complex biogeographical scenarios, involving the ability of, at least some, Late Cretaceous †enchodontids to cross oceanic basins (Cavin et al. 2012).
-
Paralepididae Gill, 1872
Type Genus
Paralepis Cuvier, 1817.
-
Paralepis Cuvier, 1817
Type Species
Paralepis coregonoides Risso, 1820.
Included Taxa
†Paralepis albyi (Sauvage, 1870).
Distribution
In Greece, this taxon is known from the Messinian of Gavdos (Metochia: †P. albyi; Gaudant et al. 2006). Outside Greece, †P. albyi is present in the late Miocene of Spain and Italy (Arambourg 1925; Gaudant 2002; Carnevale 2007). Two species of the deep-water genus Paralepis are nowadays present in the Mediterranean (Froese and Pauly 2019).
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Stomiatiformes sensu Rosen, 1973
-
Gonostomatidae Gill, 1893
Type Genus
Cyclothone Goode and Bean, 1883.
-
Cyclothone Goode and Bean, 1883
Type Species
Cyclothone acclinidens Garman, 1899.
Included Taxa
†Cyclothone gaudanti Přikryl and Carnevale, 2017.
Remarks
The modern species Cyclothone braueri, Cyclothone microdon, and Cyclothone pygmaea have been reported from the Italian Pliocene and Pleistocene (Landini and Sorbini 2005a; Přikryl and Carnevale 2017). The genus has a cosmopolitan distribution in modern deep marine waters (Froese and Pauly 2019).
-
★†Cyclothone gaudanti Přikryl and Carnevale, 2017
Nomenclatural and Taxonomical History
Cyclothone sp. in Gaudant 2004 (initial identification); Cyclothone gaudanti Přikryl and Carnevale, 2017 (new species).
Type Material
NHMW 1999z0042/0020, nearly complete, articulated individual.
Type Locality
Locality 400 m to the North of Aghia Paraskevi Chapel, vicinity of Ierapetra, Crete, Greece, Makrilia Formation.
Distribution
This species is only known from the Tortonian of Makrilia Formation, in the vicinity of Ierapetra, Crete (Aghia Paraskevi Chapel Locality, and from a locality 400 m to the North of Aghia Paraskevi Chapel; Gaudant 2004, Přikryl and Carnevale 2017). These localities constitute the whole range of this taxon.
Remarks
Cyclothone gaudanti demonstrates affinities with the small-sized and lightly pigmented species of the genus, such as Cyclothone alba, C. braueri, and Cyclothone signata (Přikryl and Carnevale 2017). Based on its affinities and the depositional environment of Makrilia Formation, it is estimated that this species possibly occupied the upper mesopelagic layer (Přikryl and Carnevale 2017).
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Sternoptychidae Duméril, 1806
Type Genus
Sternoptyx Hermann, 1781.
-
Maurolicus Cocco, 1838
Type Species
Maurolicus muelleri (Gmelin, 1789). Only included species.
Distribution
In Greece, this taxon is known with the species M. muelleri from the Tortonian of the Makrilia Formation, in the vicinity of Ierapetra, Crete (Gaudant 2004), the Messinian of Gavdos (Gaudant et al. 2006), and the Messinian of Mires (Gaudant et al. 1997a). Furthermore, Maurolicus cf. M. muelleri has been reported from the Pliocene of Heraklion as well (Gaudant 2001; Appendix). Outside Greece, M. muelleri has a continuous presence in the Mediterranean Realm (including Algeria, Italy and Spain) since the late Miocene (Gaudant 2002, 2008b; Landini and Sorbini 2005a; Gaudant et al. 2008, 2010a), and is characterized by a cosmopolitan distribution in modern bathypelagic waters (Froese and Pauly 2019).
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Argyropelecus Cocco, 1829
Type Species
Argyropelecus hemigymnus Cocco, 1829.
Distribution
In Greece, the only record of Argyropelecus sp. comes from the Pliocene (Zanclean) of Aegina Island (Argyriou and Theodorou 2011), and is figured here for the first time (Fig. 5). Outside Greece, the fossil record of the genus dates back to the Oligocene of Romania, Poland, and the Caucasus (summarized in Carnevale 2003).
Remarks
So far, only two species have been recognized on the basis of body fossils in the Mediterranean region: the late Miocene †A. logearti in Algeria (Arambourg 1927; Carnevale 2003), and the extant A. hemigymnus in the Pliocene and Pleistocene of Italy (Carnevale 2003, 2007; Landini and Sorbini 2005a).
-
Myctophiformes Regan, 1911
-
Myctophidae Gill, 1893
Type Genus
Myctophum Rafinesque, 1810a.
-
Myctophum Rafinesque, 1810a
Type Species
Myctophum punctatum Rafinesque, 1810b.
Included Taxa
†“Myctophum” licatae Sauvage, 1870; †“Myctophum” dorsale Sauvage, 1870.
Distribution
In Greece, myctophid body fossils are known from the Tortonian of Makrilia Formation, vicinity of Ierapetra (Gaudant 2004), whereas occurrences identified to the species level are known from the Tortonian–Messinian of Messara, Heraklion (Psalidha, Mires: †“Myctophum” licatae, †“Myctophum” dorsale; Tsangaraki: †“Myctophum” licatae; Gaudant et al. 1997a), and the Tortonian (Metochia, Karave: †“Myctophum” licatae) and Messinian (Metochia: †M. licatae, †M. dorsale; Fig. 5) of Gavdos (Gaudant et al. 2005, 2006). A single myctophid tooth was also recovered from the Messinian strata of ‘Unit b’ of Pigadia Basin in Karpathos (Bellas et al. 1998). Outside Greece, these two Miocene species have been recognized in several Mediterranean localities in Algeria, Spain, Italy, and Cyprus (Arambourg 1925, 1927; Gaudant 2002, 2008a, b; Merle et al. 2002; Gaudant et al. 2010a). Several extant species of Myctophum have been reported from Pliocene and Pleistocene localities of the Mediterranean (Landini and Sorbini 2005a). Nowadays, Myctophum species have a cosmopolitan bathypelagic distribution (Froese and Pauly 2019).
Remarks
Greek body fossils of Myctophidae were lumped by Gaudant in the extant genus Myctophum, following his taxonomic reappraisal of material previously studied by Arambourg (1925), from the late Miocene of Licata, Sicily (Gaudant and Ambroise 1999). However, Gaudant’s taxonomical scheme relied heavily on putatively overlapping ratios of body measurements and the overall presence or absence of photophores, and did not take important anatomical characters of synapomorphical value into proper account (see e.g., Paxton 1972; Carnevale 2007; Denton 2013). Detailed considerations of fossil myctophids from e.g., the Serravalian of Italy revealed the simultaneous presence of multiple genera—but not Myctophum—in the Mediterranean Neogene (Carnevale 2007), signaling the necessity for future revision of fossil myctophid diversity in the entirety of the Mediterranean Basin, including Greece. Given the scope of the present work, I refrain from reappraising Greek myctophid fossils and retain Gaudant’s classification in inverted commas (also employed by Gaudant in his later works). New material from Metochia C, Gavdos, collected by the author (e.g., Fig. 6), preserves delicate anatomical structures that can facilitate relevant undertakings in the future.
-
Gadiformes sensu Endo, 2002
-
Gadidae Rafinesque, 1810b
Type Genus
Gadus Linnaeus, 1758.
-
Micromesistius Gill, 1863
Type Species
Micromesistius poutassou (Risso, 1827).
Distribution
In Greece , the only fossil occurrence of Micromesistius sp. comes from the Pliocene Amnissos, Heraklion Basin (Gaudant 2001). Outside Greece, this taxon is known from the Pliocene to Pleistocene of Italy (Landini and Sorbini 2005a). The genus is nowadays present in temperate Atlantic and Pacific waters, including the Mediterranean (Froese and Pauly 2019).
-
Moridae Goode and Bean, 1896
Type Genus
Mora Risso, 1827.
-
Gadella Lowe, 1843
Type Species
Gadella gracilis Lowe, 1843.
Distribution
In Greece, occurrences of Gadella are known from the Pliocene of Attiki (Gaudant and Symeonidis 1995) and Heraklion Basin (Gaudant 2001). Outside Greece, this taxon is known from the Pliocene of Italy (Landini and Sorbini 2005a). Gadella is still present in tropical to subtropical deep waters around the world, including the Mediterranean (Froese and Pauly 2019).
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Bregmacerotidae Gill, 1872
Type Genus
Bregmaceros Thompson, 1840.
-
Bregmaceros Thompson, 1840
Type Species
Bregmaceros mcclellandi Thompson, 1840.
-
†Bregmaceros albyi (Sauvage, 1880)
Distribution
This is one of the most widely distributed taxa in Greece, with occurrences from the Tortonian of Makrilia Formation, vicinity of Ierapetra, Crete (Symeonidis 1969; Bürgin 1994; Gaudant 2004), the Tortonian and Messinian of Metochia, Gavdos (Gaudant et al. 2005, 2006), the Tortonian–early Messinian of Messara, Heraklion, Crete (Gaudant et al. 1997a), the Messinian of Karpathos (Bellas et al. 1998), the Pliocene (cf. Zanclean) of Aegina Island (Argyriou and Theodorou 2011; Fig. 7), the Pliocene of Heraklion (Gaudant et al. 1994; Müller and Strauch 1994; Gaudant 2001) and the Piacenzian of Rethymno (Symeonidis and Schultz 1973; see Appendix for more information). Outside Greece, body fossils of †Bregmaceros albyi are known from the Miocene of Algeria, Italy, Malta, and Spain, and from the Pliocene of Italy and, possibly (as †B. cf. albyi), Cyprus (Gaudant 2002; Landini and Sorbini 2005a; Přikryl et al. 2016a; and references therein). The species is also present in the early Pleistocene of Italy (Landini and Sorbini 2005a).
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Acanthomorpha Rosen, 1973
-
Atheriniformes sensu Dyer and Chernoff, 1996
-
Atherinidae Risso, 1827
Type Genus
Atherina Linnaeus, 1758.
Distribution
In Greece, atherinids are known only from the Pliocene of Attiki (Gaudant and Symeonidis 1995). Outside Greece, atherinids are known to have been present in Tethys since at least the Eocene of Monte Bolca, Italy (Carnevale et al. 2014), but their more recent fossil record in the area is largely composed of otoliths (Landini and Sorbini 2005a). Body fossils of atherinids are known from the Miocene of the Paratethys (Schwarzhans et al. 2017) and California (Jordan and Gilbert 1919).
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Beloniformes Berg, 1937
-
Belonidae Bonaparte, 1832
Type Genus
Belone Cuvier, 1817.
-
Belone Cuvier, 1817
Type Species
Belone belone (Linnaeus, 1760).
Distribution
In Greece, this taxon is only known from the Pliocene of Heraklion Basin (Gaudant et al. 1994; Gaudant 2001). Outside Greece, fossils of this taxon are more common, coming from the Oligocene of the Caucasus (Smirnov 1936), the Miocene of the USA (de Sant’Anna et al. 2013), and the Miocene to Pleistocene of Italy (Arambourg 1925; Landini and Sorbini 2005a). The genus is nowadays present in the Atlantic Ocean, the Mediterranean, and the Black Sea (Froese and Pauly 2019).
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Scomberesox Lacepède, 1803
Type Species
Scomberesox saurus (Walbaum, 1792).
Distribution
In Greece, the only possible fossils of this genus come from the Pliocene of Heraklion Basin (Gaudant 2001). Outside Greece, fossils of Scomberesox are known from the Miocene of USA, Algeria, and Italy, and the Pleistocene of Italy (Jordan and Gilbert 1919; Gaudant 2002, 2008b; Landini and Sorbini 2005a). Nowadays, the genus has a circumglobal distribution, which also includes the Mediterranean (Froese and Pauly 2019).
-
Blenniiformes sensu Springer, 1993
-
Blenniidae Rafinesque, 1810a
Type Genus
Blennius Linnaeus, 1758.
-
Salaria Forskål, 1775
Type Species
Not designated.
Included Taxa
Salaria pavo (Risso, 1810).
Nomenclatural and Taxonomical History
Initially ascribed by Gaudant et al. (1994) to the genus Blennius, as Blennius cf. B. pavo (Risso 1810). This species is now included in the genus Salaria, as S. pavo (see Eschmeyer and Fong 2019).
Distribution
In Greece, this taxon is known only from the Pliocene of Heraklion Basin (Gaudant et al. 1994). So far no additional body-fossil records exist for this taxon. Nowadays, S. pavo is present in shallow marine to brackish waters along the Western Atlantic, Mediterranean, and Black Sea coasts (Froese and Pauly 2019).
-
Perciformes sensu Betancur-R et al. 2017
-
Serranidae Swainson, 1839
Type Genus
Serranus Cuvier, 1817.
-
Serranus Cuvier, 1817
Type Species
Serranus cabrilla (Linnaeus, 1758).
Distribution
In Greece , this taxon is certainly known from the Pliocene of Heraklion Basin (Gaudant 2001), while the presence of the family has been signaled in the Pliocene of Aegina Island as well (Gaudant et al. 2010b). Outside Greece, Serranus fossils are known from the Miocene of Algeria, and the Plio-Pleistocene of Sardinia (Abbazzi et al. 2004; Gaudant 2008b). Serranus has a modern cosmopolitan, Tropical–Temperate, marine distribution (Froese and Pauly 2019).
-
Cyprinodontiformes sensu Parenti, 1981
-
Cyprinodontidae Gill, 1865
Type Genus
Cyprinodon Lacepède, 1803.
-
Aphanius Nardo, 1827
Type Species
Aphanius nanus Nardo, 1827.
Included Taxa
†A. crassicaudus Agassiz, 1839.
Nomenclatural and Taxonomical History
Initially included in the genus †Lebias (Agassiz, 1833–1843), as †L. crassicaudus (Raulin 1861). Woodward erected the genus Pachylebias to accommodate pachyostotic cyprinodontiform material from the Messinian of Italy and Crete (Woodward 1901). †Pachylebias was later found to be a junior synonym of the extant genus Aphanius (Gaudant 1979).
Distribution
In Greece, this taxon is known from the Messinian of Chania, Crete (Raulin 1861; Woodward 1901; Freuenthal 1969; Gaudant 1979, 2014b). Outside Greece, Aphanius is an essential component of Messinian oligohaline fish assemblages of the Mediterranean, including occurrences in Algeria, Spain, Morocco, and Italy (Gaudant 2002; Carnevale et al. 2018).
-
Scombriformes sensu Betancur-R et al. 2017
-
Scombridae Rafinesque, 1815
Type Genus
Scomber Linnaeus, 1758.
-
Scomber Linnaeus, 1758
Type Species
Scomber scombrus Linnaeus, 1758 (= S. scomber L., 1758).
Distribution
In Greece, this genus is only known from the Pliocene of Heraklion Basin (Gaudant 2001). Outside Greece, the genus is known from the Oligocene of central Europe and the Caucasus, and the Neogene of Russia, the United States, Japan, Algeria, Italy, Croatia, and Serbia (Arambourg 1927; Yabumoto and Uyeno 1994; Landini and Sorbini 2005a; Micklich and Hildenbrandt 2010; Gregorová 2011; Nazarkin and Bannikov 2014). Modern representatives of the genus are widespread in tropical to temperate waters (Froese and Pauly 2019).
-
Scomberomorus Lacepède, 1801
Type Species
Scomberomorus regalis (Bloch, 1793) (= S. plumierii Lacepède, 1801).
Distribution
In Greece, this genus is only known from the Pliocene of Heraklion Basin (Gaudant 2001). Outside Greece, the genus appears in the Paleocene of Turkmenistan (Monsch and Bannikov 2012). It is also known the Paleogene of Kazakhstan, Georgia, the United States, Germany, and the Neogene of Japan, Poland, and the United States (Schultz 1979; Yabumoto and Uyeno 1994; Weems 1999; Micklich and Hildenbrandt 2010; Monsch and Bannikov 2012; Weems et al. 2017). The genus is found today in tropical-subtropical waters of the Atlantic, Indian, and Pacific oceans, and the Western Mediterranean (Froese and Pauly 2019).
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Trichiuridae Rafinesque, 1810a
Type Genus
Trichiurus Linnaeus, 1758.
-
Lepidopus Goüan, 1770
Type Species
Lepidopus caudatus Euphrasen, 1788.
Included Taxa
†L. albyi Sauvage, 1870.
Distribution
In Greece, this genus is known from the Tortonian of Makrilia Formation, in the vicinity of Ierapetra, Crete (Symeonidis 1969; Gaudant 2004), the Tortonian and Messinian of Gavdos (Gaudant et al. 2005), the Messinian of Messara (as †Lepidopus albyi in the text, but Lepidopus sp. in the respective figure caption; Gaudant et al. 1997a), and the Pliocene of Heraklion Basin and Rethymno (Gaudant et al. 1994; Gaudant 2001; see Appendix for further information). Outside Greece, †Lepidopus albyi is known from the late Miocene of Algeria, Spain, Italy, Cyprus, and Pliocene of Italy (Arambourg 1925, 1927; Gaudant 2002; Merle et al. 2002; Landini and Sorbini 2005a). A second fossil species, †Lepidopus proargenteus, is known from the late Miocene of Algeria and Italy (Arambourg 1927; Gaudant 2008b; Gaudant et al. 2010a). Remains affiliated with the living L. caudatus have been reported from the Pliocene of Italy (Landini and Sorbini 2005a).
Remarks
Symeonidis tentatively ascribed fragmentary remains of a juvenile Lepidopus from the Tortonian of Crete to the Oligocene Paratethyan species †Anenchelum glaricianum (his †Lepidopus cf. glaricianus, Symeonidis 1969). Gaudant revised this attribution to Lepidopus sp. (Gaudant 2004).
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Gobiiformes Günther, 1880
-
Gobiidae Cuvier, 1817
Type Genus
Gobius Linnaeus, 1758.
-
Gobius Linnaeus, 1758
Type Species
Gobius niger Linnaeus, 1758.
Distribution
In Greece, unidentified records of this genus are reported from the Pliocene of Heraklion Basin (Gaudant et al. 1994) and Attiki (Gaudant and Symeonidis 1995). Outside Greece, Gobius skeletons first appear in the early Miocene of the Czech Republic (Reichenbacher et al. 2018), but are found in a wide array of Neogene fossil sites in North Africa, Europe, and Asia Minor (Arambourg 1927; Gaudant 2002; Böhme and Ilg 2003; Reichenbacher et al. 2018). Gobius has a circumglobal modern distribution (Froese and Pauly 2019).
Comments
Gobioids are among the largest clades of vertebrates (Nelson et al. 2016). In many cases, included genera and species are diagnosed on the basis of very delicate anatomical features and soft tissue structures, which are not often visible/preserved in fossils (Reichenbacher et al. 2018). Thus, Greek gobiid fossils only loosely affiliate with Gobius (Gaudant et al. 1994; Gaudant and Symeonidis 1995), and might actually encompass other genera as well. It should be noted here that poorly documented occurrences of Gobiidae in the Miocene of Kymi have been ascribed to the genus Periophthalmus (Unger 1867; Appendix), but, due to lack of descriptive or pictorial documentation, these are not further treated here.
-
Carangiformes sensu Betancur-R et al. 2017
-
Carangidae Rafinesque, 1815
Type Genus
Caranx Lacepède, 1801.
-
Caranx Lacepède, 1801
Type Species
Caranx hippos (Linnaeus, 1766).
Distribution
In Greece, this genus is only known from the Pliocene of Heraklion Basin (Gaudant 2001). Outside Greece, this taxon is known from the Miocene of Algeria, Italy (Arambourg 1925, 1927), but also from the Paratethys (Schwarzhans et al. 2017).
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Alectis Rafinesque, 1815
Type Species
Alectis ciliaris (Bloch, 1787).
-
★†Alectis psarianosi (Symeonidis, 1969)
Nomenclatural and Taxonomical History
This species , based on a single specimen from the Tortonian of Crete, was formerly included in the genus Mene (Menidae), as †Mene psarianosi (Symeonidis 1969). It was later reattributed to the carangid genus Alectis, but the species name was retained (Bannikov 1984, 1987; Gaudant 2004).
Type Material
AMPG 185/1969, complete, laterally compressed individual (Fig. 8).
Type Locality
Tortonian of Makrilia Formation, vicinity of Ierapetra, Crete (Aghia Paraskevi Chapel Locality; Symeonidis 1969; Gaudant 2004).
Distribution
Known only from the type locality.
Remarks
Bannikov (1987) dispelled the original, poorly supported attribution of this unique fossil to Menidae by Symeonidis (1969), after recognizing typical carangid features, including a high rhomboidal body shape ; a well-developed fronto-occipital crest; and the relative length of fin rays in its median fins. Gaudant (2004) re-examined the specimen, providing its first detailed anatomical description and confirming Bannikov’s assessment, but without attempting additional comparisons. According to Bannikov (1987), this fossil species differs from modern species in having “somewhat shorter anterior rays of the soft unpaired fins.” Whether this difference is sufficient to maintain †Alectis psarianosi as a valid fossil species remains to be investigated in the future , given the fact that the fossil corresponds to a somewhat small, possibly immature, individual.
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Trachurus Rafinesque, 1810a
Type Species
Trachurus trachurus (Linnaeus, 1758) (= T. saurus Rafinesque, 1810b).
Distribution
In Greece, occurrence of this genus comes from the Tortonian of Makrilia Formation, in the vicinity of Ierapetra, Crete (Gaudant 2004), the Pliocene of Attiki (Gaudant and Symeonidis 1995), and the Pliocene of Heraklion (Gaudant 2001; see Appendix for further information). Outside Greece, fossils more or less securely attributed to Trachurus are known from the Miocene of Algeria and Spain, the Miocene and Pliocene of Italy and the Pliocene of Cyprus (Arambourg 1927; Landini and Sorbini 2005a; Gaudant 2008a, b; Gaudant et al. 2010a; Gaudant and Courme 2014). Three species of Trachurus are native to modern Mediterranean pelagic habitats (Froese and Pauly 2019).
-
Spariformes sensu Akazaki, 1962
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Sparidae Rafinesque, 1810a
Type Genus
Sparus Linnaeus, 1758.
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Boops Cuvier, 1814
Type Species
Boops boops (Linnaeus, 1758).
Distribution
In Greece, this genus is known from the Pliocene of Heraklion Basin with various occurrences (Gaudant et al. 1994; Gaudant 2001). Outside Greece, Boops fossils have been found in the Miocene of Algeria and the Miocene and Pliocene of Italy (Arambourg 1927; Gaudant 2002). Nowadays, Boops is represented by two species, one of which, B. boops, occurs in the Mediterranean (Froese and Pauly 2019).
Comments
Gaudant et al. (1994) initially ascribed the Amnissos boopsins to Boops cf. B. boops . In a subsequent work, Gaudant (2001) noted differences in meristic features of the dorsal and caudal fins of the Boops from Amnissos, from both the Miocene species †B. roulei (Arambourg 1927), and the extant B. boops, leaving the Cretan fossils in open nomenclature, and implying that they might correspond to a new species. This might also be true for the remaining Heraklion Basin boopsins. As evidenced by isolated teeth, additional sparids were likely present in the Messinian of Karpathos (Bellas et al. 1998).
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Centriscidae Bonaparte, 1831
Type Genus
Centriscus Linnaeus, 1758.
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Aeoliscus Jordan and Starks, 1902
Type Species
Aeoliscus strigatus (Günther, 1861).
Nomenclatural and Taxonomical History
Centriscids from the Pliocene of Amnissos were initially thought to correspond to a new fossil species (†Amphisile cretensis Bachmayer et al. 1984). Gaudant re-examined these specimens and tentatively ascribed these fossils to the extant genus Amphisile (Cuvier 1817), as Amphisile cf. strigata (Gaudant 2001). Amphihisile strigata is, however, a synonym of Aeoliscus. strigatus (Günther 1861. In a subsequent work, Gaudant corrected the taxonomic designation of the Cretan material to Aeoliscus cf. strigatus (Gaudant and Courme 2014).
Distribution
In Greece, this taxon is known from the Pliocene of Heraklion Basin, (Bachmayer et al. 1984; Gaudant 2001). Outside Greece, Aeoliscus. strigatus is also known from the late Miocene and Pliocene of Italy and the Pliocene of Cyprus (Gaudant 2002; Landini and Sorbini 2005a; Gaudant and Courme 2014). This species is nowadays encountered in tropical Indo-Pacific waters (Froese and Pauly 2019).
Remarks
Given the invalidity of the genus Amphisile (see above), the occurrence of Amphisile sp. in the Messinian of Gavdos (Gaudant et al. 2006) is hereby treated conservatively as Centriscidae indet.
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Syngnathidae Rafinesque, 1810a
Type Genus
Syngnathus Linnaeus, 1758.
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Syngnathus Linnaeus, 1758
Type Species
Syngnathus acus Linnaeus, 1758.
Included Taxa
†Syngnathus albyi Sauvage, 1870.
Nomenclatural and Taxonomical History
Two fossil species of Syngnathus have been erected on the basis of material from the Neogene of Crete: the late Miocene †S. kaehsbaueri Bachmayer and Symeonidis (1978) from Aghia Paraskevi Chapel, Makrilia Formation, in the vicinity of Ierapetra, and the Pliocene ★†S. heraklionis Bachmayer et al., 1984 from Amnissos, near Heraklion. Reinvestigations of the type material of both species found no anatomical differences from the Miocene species †S. albyi (Sauvage 1870), establishing the Cretan species as invalid and referred their type material to †Syngnathus cf. †S. albyi (Gaudant 2001, 2004).
Distribution
In Greece, occurrences of this taxon are known from the Tortonian of Makrilia Formation, near Ierapetra, Crete (Bachmayer and Symeonidis 1978; Gaudant 2004), the Tortonian and Messinian of Metochia, Gavdos (Gaudant et al. 2005, 2006), the Messinian of Messara, Crete (Gaudant et al. 1997a), and the Pliocene of Heraklion, Crete (Bachmayer et al. 1984; Gaudant et al. 1994; Gaudant 2001). Remains of short-snouted Syngnathus cf. S. acus were also found in the Pliocene (cf. Zanclean) of Aegina (Argyriou and Theodorou 2011, Fig. 9). Outside Greece, the fossil species †S. albyi is common in “middle” and late Miocene and possibly Pliocene faunas of Algeria, Spain, Italy, and Cyprus (Arambourg 1925, 1927; Gaudant et al. 2000, 2010a; Gaudant 2002, 2008b; Merle et al. 2002; Landini and Sorbini 2005a; Carnevale 2007), whereas records of this species in the Miocene of Paratethys are considered dubious (Schwarzhans et al. 2017). The modern species S. acus and S. phlegon have been reported from the late Pliocene and Pleistocene of Italy (Landini and Sorbini 2005a).
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Dactylopteridae Gill, 1861
Type Genus
Dactylopterus Lacepède, 1801.
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Dactylopterus Lacepède, 1801
Type Species
Dactylopterus volitans (Linnaeus, 1758).
Distribution
In Greece, this taxon is only known from the Pliocene of Heraklion Basin. Outside Greece, it is known from the Pliocene of Italy and Cyprus (Landini and Sorbini 2005a; Gaudant and Courme 2014). One species survives in the Atlantic and the Mediterranean (Froese and Pauly 2019).
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Pleuronectiformes Bleeker, 1859
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Bothidae Smitt, 1892
Type Genus
Bothus Rafinesque, 1810a.
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Arnoglossus Bleeker, 1862
Type Species
Pleuronectes arnoglossus (Bloch and Schneider, 1801) (junior synonym of Arnoglossus laterna Walbaum, 1792).
Distribution
In Greece, this taxon is only known from the Tortonian of Makrilia Formation, in the vicinity of Ierapetra, Crete (Gaudant 2004). Outside Greece, Arnoglossus is reported in the Miocene of Algeria and Spain, and from the Miocene, Pliocene, and Pleistocene of Italy (Landini and Sorbini 2005a; Gaudant 2008a, b; Gaudant et al. 2010a). Arnoglossus has a cosmopolitan modern distribution (Froese and Pauly 2019).
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Centropomidae sensu Greenwood, 1976
Type Genus
Not established.
-
Latinae indet.
Nomenclatural and Taxonomical History
This fossil was initially employed to establish the genus †Allocotus by de Waldheim (1838). In a following publication, de Waldheim, erected a new genus and species, †Platacanthus ubinoi, to accommodate the same individual (de Waldheim 1850). The Musée de la Société Impériale des Naturalistes, Moscow, was listed as repository of this specimen (Fig. 9a). Woodward reassigned †P. ubinoi to the modern genus Morone (his Labrax), utilizing additional material from the Tertiary of Kymi, Greece, deposited in what is nowadays the Natural History Museum, UK (Woodward 1901), which, however, might correspond to a different taxon. Given the unknown location and status of the type material for these taxa, and their almost complete disappearance from the literature (but see Bannikov 1993), I suggest that †Allocotus should be treated as invalid and †Morone ubinoi as nomen dubium. Adding to the confusion, additional percomorph taxa have been signaled in the Miocene of Kymi, but all these old attributions are doubtful and poorly documented (Valenciennes 1861; Gaudry 1862; Unger 1867; Appendix). The holotype of one of these, known as †Smerdis isabellae Gaudry 1862, has been synonymized by MNHN, Paris, staff with Woodward’s †Morone (= Labrax) ubinoi in the early 1900s (T.A. personal observations).
Distribution
In Greece, this taxon is known (possibly) from the early Miocene of an unknown locality near Kymi, Euboea. Outside Greece, Lates-like Centropomidae were present in Eocene–Neogene freshwater, brackish and sometimes marine deposits in Europe and Afroarabia (Murray and Attia 2004; Otero 2004; Argyriou et al. 2015). A total of fourteen species (Eschmeyer and Fong 2019) survive in African fresh–estuarine waters, and Indo-Pacific coastal environments (Froese and Pauly 2019).
Comments
The original description of this taxon does not contain clear information about its geographical or lithological provenance, other than that the fossil comes from some calcareous, oolithic horizon in Greece, which was thought to resemble the Solnhofen limestone (de Waldheim 1850). This specimen was not found by the author himself, but was sent to him by a certain Dr. Ubino who found, or purchased it during his travels through Greece (de Waldheim 1838). Woodward traces the provenance of the material in British collections to the freshwater deposits of Kymi, Greece. It is thus logical to hypothesize that this specimen derives from the classical Miocene plant and fish-bearing horizons of Kymi (e.g., Unger 1867; Kottis et al. 2002), yet this needs to be corroborated by future sampling. Although the drawings of the specimen are rather uninformative (de Waldheim 1838, 1850), the figured individual shows a preopercle bearing a horizontal anteroventral arm, which, in turn, forms a robust posterior spinous process, and three robust ventral processes (Fig. 10a). The possible resemblance of this animal to the percichthyid †Cyclopoma (= Cyclopome), or the centropomid Lates was noted by de Waldheim (1838). The imaged preopercle differs clearly from that of the preopercle of the Eocene genus †Cyclopoma (Agassiz 1833–1843). The shape and orientation of these processes resemble instead the preopercles of Latinae (Latidae in Otero 2004; now included within Centropomidae; see Greenwood 1976, Betancur-R et al. 2017; Fig. 10b), leaving little room for doubt that the illustrated skull is a Lates-like centropomid. Despite this profound resemblance, and unlike Latinae (Otero 2004), the posterior margin of the dorsal limb of the Kymi specimen is figured as non-serrate, but this feature might have been poorly preserved, or illustrated. Additional similarities between the illustrated Kymi specimen and Lates-like animals (Otero 2004) can be found in the acute ventral and anterior processes of the ectopterygoid, or what appears to be a broad palatine toothplate, in the anterior portion of the skull, and in what appears to be a single, posterodorsal process of the opercle. Woodward, possibly based on material from Kymi housed in British collections, mentioned that †Morone (= Labrax) ubinoi lacks a posterior spinous process of the preopercle, and also exhibits two feeble spines on the posterior margin of the opercle (Woodward 1901). It is thus possible that Woodward lumped two different taxa, one being a moronid and the other being de Waldheim’s centropomid, into one. This highlights the need to restudy Woodward’s material. This notion is reinforced by personal observations on Gaudry’s material, which was used to establish the species †Smerdis isabellae and is now housed at the MNHN, Paris. The latter would require a detailed study to clarify its taxonomic status , which lies beyond the context of this work.
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Labridae Cuvier, 1817
Type Genus
Labrus Linnaeus, 1758.
Distribution
In Greece, this group is known from the Pliocene of Heraklion Basin (Gaudant 2001). Ichthyoliths from the Pliocene of Aghia Marina, Aegina Island, have been tentatively attributed to the sparid †Sargus cf. oweni (Leivaditis 1974), which was in turn found to be a junior synonym of the labrid †Trigonodon jugleri (Schultz and Bellwood 2004). This might correspond to another occurrence of Labridae in Greece, but it is so far poorly substantiated. Labrids appear in the Eocene of Italy (Bannikov and Carnevale 2010). Mostly disarticulated (e.g., oral or pharyngeal teeth), but also articulated remains are common in Neogene deposits around the world (e.g., Algeria, Italy, France, Portugal, Poland, Austria, Nigeria, the United States, and New Zealand; summarized in Bellwood et al. 2019).
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Acanthuriformes sensu Betancur-R et al. 2017
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Acanthuridae Bleeker, 1859
Type Genus
Acanthurus Forskål, 1775.
Distribution
In Greece, this taxon is known from the Tortonian of Makrilia Formation, in the vicinity of Ierapetra, Crete (Gaudant 2004), and the Tortonian of Gavdos (Gaudant et al. 2005). Outside Greece, articulated acanthurid fossils are known from the Paleogene of Europe (e.g., Italy, Switzerland, Russia) (Tyler and Bannikov 2000; Tyler and Micklich 2011), while their Miocene occurrences (e.g., Austria and Croatia) usually correspond to isolated teeth (Schultz 2003; Tripalo et al. 2016). Nowadays, the family is absent from the Mediterranean, but is otherwise characterized by circumtropical distribution (Froese and Pauly 2019).
Comments
The Gavdos specimen is probably a juvenile (Gaudant et al. 2005).
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Tetraodontiformes Berg, 1937
-
Monacanthidae Nardo, 1842
Type Genus
Monacanthus Oken, 1817.
-
† Frigocanthus Sorbini and Tyler, 2004
Type Species
†Frigocanthus stroppanobili Sorbini and Tyler, 2004.
Included Taxa
†Frigocanthus margaritatus Sorbini and Tyler, 2004.
Distribution
In Greece, †F. margaritatus is known from the Pliocene of Heraklion Basin (Gaudant 2001; Sorbini and Tyler 2004), whereas †F. stroppanobili from the middle-late Pliocene of Chania , Crete (Sorbini and Tyler 2004). Outside Greece, this taxon is known from the Pliocene and Pleistocene of Italy (Sorbini and Tyler 2004).
-
Caproiformes sensu Rosen, 1984
-
Caproidae Lowe, 1843
Type Genus
Capros Lacepède, 1802.
-
Capros Lacepède, 1802
Type Species
Capros (= Zeus) aper (Linnaeus, 1758).
Distribution
In Greece, this genus is known only from the Tortonian of Makrilia Formation, in the vicinity of Ierapetra (Gaudant 2004). Outside Greece, fossil species of the genus have been recognized in the Oligocene of the Carpathians, the Caucasus, Germany, and France (Baciu et al. 2005b; Přikryl et al. 2016c), and the late Miocene of Italy and Algeria (Baciu et al. 2005a). The living species C. aper is known from the Pliocene–Pleistocene of Italy (Landini and Sorbini 2005a).
6 Conclusions and Avenues for Future Research
Over a century and a half of exploration and sporadic scientific research on the actinopterygian fossil record of Greece has led to the discovery of numerous fossil sites, and laid the foundations for further work on the regional fossil record of the clade. Actinopterygian fossils in Greece have a patchy record that spans over 180 million years, from the Toarcian (Lower Jurassic) to the Quaternary, with the vast majority of known occurrences concentrated in the late Neogene (late Miocene–Pliocene) and being of clear marine affinities (summarized in the Appendix). Little information is available for older, or freshwater and brackish localities. The pre-Neogene fossil record of Greece merits further scientific attention and exploration, especially given the huge record of sedimentary rocks and complex geological history of Greece. Deposits predating the Jurassic have not yet, to the author’s knowledge, been investigated extensively for potential paleoichthyological content (excluding conodonts), and like in the case of chondrichthyans (Argyriou et al. 2017), actinopterygian fossils are anticipated in Paleozoic–early Mesozoic deposits.
Historically, alpine sedimentary formations of Greece (e.g., the “External Hellenides”), which record a major part of the Mesozoic and early Cenozoic, have been considered to be of principally tectonostratigraphic importance to the geological and paleontological community, and have remained outside the interest of vertebrate paleontologists. Yet, preliminary investigations have indicated the yet untapped paleoichthyological potential of such deposits. The presumably rich Toarcian bonebeds of Ionian Unit exposures in Lefkada have been totally neglected since their first discovery (Kottek 1964), despite their potential informativeness on early teleost diversification. Moreover, understudied fish assemblages from the late Cretaceous–Paleogene of Pindos Unit can shed light on the evolution and biogeography of Tethyan faunas (Koch and Nikolaus 1969; Cavin et al. 2012; Argyriou and Davesne 2021; pers. obs. on the K/Pg of Eurytania, Northern–Central Peloponnese and Gavdos) during this critical time interval of global marine restructuring, which is otherwise poorly documented in the global fossil record. Further research should be directed toward freshwater and brackish faunas, which are so far known from Miocene or younger deposits (e.g., Miocene of Kymi Euboea: de Waldheim 1838, 1850; Unger 1867; Miocene of Chios: Reichenbacher and Böhme 2004), and their insights into the evolution of modern European freshwater ichthyofaunas and their biogeographical and paleohydrological inferences.
Late Miocene–Pliocene fossiliferous localities and horizons, especially the ones in Crete and Gavdos, host diverse actinopterygian assemblages of often exquisite preservation quality (Gaudant et al. 1994, 1997a, 2005, 2006; Gaudant 2001, 2004). Numerous families and genera have already been recognized in these assemblages, largely on the basis of broad morphological and meristic similarities with late Miocene taxa from Italy and Algeria (e.g., Arambourg 1925, 1927; Gaudant 2008b). Previous works, however, have treated these assemblages from an alpha-taxonomic point of view, and provided some limited information on their paleoenvironmental significance. Additional taxonomic diversity, including new species, remains to be identified in these sites, pending detailed anatomical descriptions (Přikryl and Carnevale 2017), and is a prerequisite for further systematic and biogeographic work. The importance of following this line of research cannot be overstressed, especially when taking into account the scarcity of information for this part of (Neo)Tethys, in comparison to what is now the Western and Central Mediterranean (e.g., Arambourg 1925, 1927; Landini and Sorbini 2005a; Carnevale 2007; Gaudant 2008a, b). Research on Greek fossils is anticipated to unveil further clues for tracing the gradual emergence of the modern endemic and Atlantic hallmark of Mediterranean marine faunas from the tropical, Indopacific-like faunas of the Miocene, and the role of major events, such as the Messinian Salinity Crisis and Pleistocene cooling(s) in this process (Gaudant et al. 1994, 1997a, 2005, 2006; Gaudant 2001, 2002, 2004; Landini and Sorbini 2005a, b).
This work collates available information on actinopterygian fossils and their spatiotemporal distribution in Greece, as well as their potential significance. It is hoped to form a stimulating basis for further paleoichthyological research in the country. As a concluding remark, properly curated paleoichthyological collections of Greek fish fossils are crucial for invigorating paleoichthyology in the country, and, given funding and staff limitations, Greek institutions and museums are encouraged to work toward this goal.
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Acknowledgments
I am indebted to my former advisors and mentors G. Theodorou and P. Pavlakis (both NKUA) for supporting and encouraging me early to work on the fossil fishes of Greece, and beyond. S. Roussiakis (NKUA) is thanked for providing collection assistance and scientific discussion, and K. Agiadi (NKUA) is thanked for useful and stimulating discussions on the particulars of this chapter. Several colleagues are thanked for helping the author (re)assess some of the information presented here on the field. Listed in alphabetic order are: K. Agiadi (NKUA); A. Alexopoulos (NKUA); J. Carrillo-Briceño (Univ. Zurich); L. Cavin (MNHN, Geneva); D. Davesne (Oxford Univ.); I. Dimitriou; C. Fassoulas (NHM, Crete); A. Filipidi (Univ. Utrecht); C. Giamali (NKUA); G. Iliopoulos (Univ. Patras); E. Koskeridou (NKUA); M. Louvari (NKUA); S. Roussiakis (NKUA); G. Theodorou (NKUA); K Trikolas. Giorgio Carnevale (Univ. Torino), Charalampos Kevrekidis (LMU Munich) and C. Romano (Univ. Zurich) are thanked for their insightful reviews, which improved the quality of this work. This research was funded by a Swiss National Science Foundation early postdoctoral mobility grant (P2ZHP3_184216) to the author.
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Appendix
Appendix
Tables with a detail list of the occurrences of ray-finned fishes in Greece.
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Argyriou, T. (2022). The Fossil Record of Ray-Finned Fishes (Actinopterygii) in Greece. In: Vlachos, E. (eds) Fossil Vertebrates of Greece Vol. 1. Springer, Cham. https://doi.org/10.1007/978-3-030-68398-6_4
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