Advertisement

Paläontologische Zeitschrift

, Volume 72, Issue 3–4, pp 337–350 | Cite as

Apparatus structure of the Ordovician conodontDecoriconus peselephantis (Lindström 1955)

  • Anita Löfgren
Article

Abstract

The Lower Ordovician conodont species first described asScolopodusl peselephantis Lindström 1955, has a seximembrate apparatus of laterally compressed, variously curved and flexed coniform elements. These are very small and invariably striated or multicostate. The taxon is reassigned toDecoriconus Cooper 1975, a genus hitherto known by species from Upper Ordovician and Silurian strata. These younger species share several characteristic morphological features with the older species investigated in this work. When studied in detail, it was discovered thatD. peselephantis was the first species in a lineage which also included two successive new species. Of these,D. mercurius n. sp. occurs in the middle Arenig, whileD. pesequus n. sp. ranges from the late middle Arenig and at least through the Llanvirn, possibly even into the Caradoc. These new species, which were previously included intoS.? peselephantis, are described and their geographic distribution investigated. In addition, a probable homeomorphic form ofD. peselephantis, Toxotodus? gabriellae n. sp., is diagnosed.

Keywords

Ordovician Outer Side Posterior Edge Late Ordovician Basal Cavity 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Kurzfassung

Die unterordovizische Conodontenart, die zuerst alsScolopodus?peselephantis Lindström 1955 beschrieben worden war, hat einen seximembraten Apparat mit kleinen, konstant berippten, lateral komprimierten und unterschiedlich gekrümmten koniformen Elementen. Die Art wird hier zuDecoriconus Cooper 1975 gestellt, eine Gattung, die bisher nur mit Arten aus dem Spätordovizium und Silur bekannt war. Diese jüngeren Arten haben verschiedene charakteristische morphologische Merkmale gemeinsam mit den älteren Arten, die hier untersucht werden. Nach detaillierter Untersuchung hat sichD. peselephantis als erste Art in einer Entwicklungslinie erwiesen, die zudem auch zwei neue Arten umfaßt:D. mercurius n. sp. aus dem Mittelarenig undD. pesequus n. sp. aus dem späten Mittelarenig, dem gesamten Llanvirn, möglicherweise auch bis in das Caradoc hinein. Diese neuen Arten, die zuvor inS.?peselephantis einbezogen waren, werden hier beschrieben und ihre geographische Verbreitung untersucht. Außerdem wird auch eine zuD. peselephantis wahrscheinlich homöomorphe Form,Toxotodus? gabriellae n. sp., beschrieben.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Abaimova, G. P. 1975. Ranneordovikskie konodonty srednego techeniya R. Leny [Early Ordovician conodonts of central course of the Lena River]. -SNIGGIMS Trudy207. - 129 pp., Novosibirsk.Google Scholar
  2. Abdulin, A. A.;Appolonov, M. K. &Ergaliev, G. K. [eds.] 1990. The third International Symposium on the Cambrian System. Excursion 2, guide-book; 10–16 August 1990, Kazakh SSR. Malyi Karatau. - 61 pp., Alma-ata.Google Scholar
  3. Albanesi, G. L. 1998. Taxonomia de conodontes de las secuencias ordovicicas del cerro Potrerillo, Precordillera Central de San Juan, R. Argentina. - Actas de la Academia Nacional de Ciencias12: 101–252, Cordoba/Argentina.Google Scholar
  4. An Tai-Xiang;Du Guo-Qing &Gao Qin-Qin 1985. Ordovician conodonts from Hubei, China. - 63 pp., 18 pls., Beijing (Geological Publishing House). - [In Chinese with English summary].Google Scholar
  5. Armstrong, H. A. 1997. Conodonts from the Ordovician Shinnel Formation, Southern Uplands, Scotland. - Palaeontology40: 763–797, Cambridge/ England.Google Scholar
  6. Armstrong, H. A.;Johnson, E. W. &Scott, R. W. 1996. Conodont biostratigraphy of the attenuated Dent Group (upper Ordovician) at Hartley Ground, Broughton in Furness, Cumbria, U.K. - Proceedings of the Yorkshire Geological Society51: 9–21, Hull.Google Scholar
  7. Bagnoli, G. &Stouge, S. 1997. Lower Ordovician (Billingenian - Kunda) conodont zonation and provinces based on sections from Horns Udde, north Öland, Sweden. - Bolletino délia Società Paléontologica a Italiana35(2): 109–163, 7 text-figs., 8 pls., Modena.Google Scholar
  8. Barnes, C. R.;Kennedy, D. J.;McCracken, A. D.;Nowlan, G. S. &Tarrant, G. A. 1979. The structure and evolution of Ordovician conodont apparatuses. - Lethaia12: 125–151, Oslo.CrossRefGoogle Scholar
  9. Barrick, J. E. 1977. Multielement simple-cone conodonts from the Clarita Formation (Silurian), Arbuckle Mountains, Oklahoma. -Geologica et Palaeontologica11: 47–68, Marburg.Google Scholar
  10. Bednarczyk, W. 1971. Ordovik wschodniej czesci obnizenia podlaskiego [The Ordovician of the eastern part of the Podlasie depression]. - Acta Geologica Polonica21: 201–212, 6 pls., Warszawa.Google Scholar
  11. Bergström, S. M. 1988. On Pander’s Ordovician conodonts: distribution and significance of thePrioniodus elegans fauna in Baltoscandia. - Senckenbergiana lethaea69: 217–251, Frankfurt am Main.Google Scholar
  12. Branson, E. B. &Mehl, M. G. 1933. Conodonts from the Bainbridge (Silurian) of Missouri. -[In:] Conodont studies number one. - The University of Missouri Studies8: 39–52, Columbia/ Missouri.Google Scholar
  13. Bruton, D. L.;Harper, D. A. T. &Repetski, J. E. 1989. Stratigraphy and faunas of the Parautochthon and Lower Allochthon of southern Norway. - [In:] The Caledonide geology of Scandinavia: 231–241, Oslo.Google Scholar
  14. Cooper, B. J. 1975. Multielement conodonts from the Brassfield Limestone (Silurian) of southern Ohio. - Journal of Paleontology49: 984–1008, Tulsa/Oklahoma.Google Scholar
  15. Dubinina, S. V. 1984. Conodont plates and explanations. - [In:] Trilobites and conodonts from the Batyrbay section (uppermost Cambrian - lower Ordovician) in Malyi Karatau Range (atlas of palaeontological plates). - 48 pp., Alma-Ata (‘NAUKA’, Kazakh SSR Publishing House).Google Scholar
  16. Dzik, J. 1976. Remarks on the evolution of Ordovician conodonts. - Acta Palaeontologica Polonica21: 395–455, Warszawa.Google Scholar
  17. — 1990. Conodont evolution in high latitudes of the Ordovician. - Courier Forschungsinstitut Senckenberg117: 1–28, Frankfurt am Main.Google Scholar
  18. — 1991. Evolution of oral apparatuses in the conodont chordates. - Acta Palaeontologica Polonica36: 265–323, Warszawa.Google Scholar
  19. - 1994. Conodonts of the Mojcza Limestone. - [In:]Dzik, J.;Olempska, E. &Pisera, A. [eds.] Ordovician carbonate platform ecosystem of the Holy Cross Mountains. - Palaeontologica Polonica53: 43–128, Warszawa.Google Scholar
  20. Dzik, J. &Drygant, D. 1986. The apparatus of panderodontid conodonts. - Lethaia19: 133–141, Oslo.CrossRefGoogle Scholar
  21. Ethington, R. L. &Brand, U. 1981.Oneotodus simplex (Furnish) and the genusOneotodus (Conodonta). - Journal of Paleontology55: 239–247, Tulsa/ Oklahoma.Google Scholar
  22. Ethington, R. L. &Clark, D. L. 1982. Lower and Middle Ordovician conodonts from the Ibex Area Western Millard County, Utah. - Brigham Young University, Geological Studies28: 1–160, Provo/ Utah.Google Scholar
  23. Fåhraeus, L. E. 1966. Lower Viruan (Middle Ordovician) conodonts from the Gullhögen quarry, southern central Sweden. - Sveriges Geologiska UndersökningC610: 1–40, Stockholm.Google Scholar
  24. — 1982. Recognition and redescription ofPander’s (1856)Scolopodus (form-)species -Constituents of multi-element taxa (Conodontophorida, Ordovician). - Geologica et Palaeontologica16: 19–28, 3 pls., Marburg.Google Scholar
  25. Fortey, R. A.;Harper, D. A. T.;Ingham, J.K.;Owen, A. W. &Rushton, A. W. A. 1995. A revision of the Ordovician series and stages from the historical type area. - Geological Magazine132: 15–30. Cambridge/ England.Google Scholar
  26. Hamar, G. 1964. The Middle Ordovician of the Oslo Region, Norway. 17. Conodonts from the lower Middle Ordovician of Ringerike.- Norsk Geologisk Tidsskrift44: 243–292, Bergen.Google Scholar
  27. Jeppsson, L. 1971. Element arrangement in conodont apparatuses ofHindeodella type and in similar forms. - Lethaia4: 101–123, Oslo.CrossRefGoogle Scholar
  28. — 1983. Simple cone studies: some provocative thoughts. - Fossils and Strata15: 86, Oslo.Google Scholar
  29. Jeppsson, L.;Fredholm, D. &Mattiasson, B. 1985. Acetic acid and phosphatic fossils - a warning. - Journal of Paleontology59: 952–956, Tulsa/Oklahoma.Google Scholar
  30. Ji Zailiang &Barnes, C. R. 1994. Lower Ordovician conodonts of the St. George Group, Port au Port Peninsula, western Newfoundland, Canada. - Palaeontographica Canadiana11: 1–149, Toronto.Google Scholar
  31. Lehnert, O. 1995. Ordovizische Conodonten aus der Präkordillere Westargentiniens: Ihre Bedeutung für Stratigraphie und Paläogeographie. - Erlanger geologische Abhandlungen125: 1–193, Erlangen.Google Scholar
  32. Lindström, M. 1955. Conodonts from the lowermost Ordovician strata of south-central Sweden. - Geologiska Föreningens i Stockholm Förhandlingar76: 517–604, Stockholm.Google Scholar
  33. — 1971. Lower Ordovician conodonts of Europe. - Geological Society of America Memoir127: 21–61, Boulder/ Colorado.Google Scholar
  34. — 1984. Baltoscandic conodont life environments in the Ordovician: Sedimentologic and paleogeographic evidence. - Geological Society of America Special Paper196: 33–42, Boulder/ Colorado.Google Scholar
  35. Löfgren, A. 1978. Arenigian and Llanvirnian conodonts from Jämtland, northern Sweden. - Fossils and Strata13: 1–129, Oslo.Google Scholar
  36. — 1985. Early Ordovician conodont biozonation at Finn gründet, south Bothnian Bay, Sweden. (Geology of the southern Bothnian Sea. Part III.) - Bulletin of the Geological Institutions of the University of Uppsala, new series10: 115–128, Uppsala.Google Scholar
  37. — 1993a. Conodonts from the Lower Ordovician at Hunneberg, south-central Sweden. - Geological Magazine130: 215–232, Cambridge/England.Google Scholar
  38. — 1993b. Arenig conodont successions from central Sweden. - Geologiska Föreningens i Stockholm Förhandlingar115: 193–207, Stockholm.Google Scholar
  39. — 1994. Arenig (Lower Ordovician) conodonts and biozonation in the eastern Siljan district, central Sweden. - Journal of Paleontology68: 1350–1368, Lawrence/ Kansas.Google Scholar
  40. — 1995. The middle Lanna/Volkhov Stage (middle Arenig) in Sweden and its conodont fauna. -Geological Magazine132: 693–711, Cambridge/England.CrossRefGoogle Scholar
  41. — 1996. Lower Ordovician conodonts, reworking, and biostratigraphy of the Orreholmen quarry, Västergötland, south-central Sweden. - GFF118: 169–183, Stockholm.Google Scholar
  42. — 1997a. Reinterpretation of the Lower Ordovician conodont apparatusParoistodus. -Palaeontology40: 913–929, London.Google Scholar
  43. — 1997b. Conodont faunas from the upper Tremadoc at Brattefors, south-central Sweden, and reconstruction of thePaltodus apparatus. - GFF119: 257–266, Stockholm.Google Scholar
  44. - in press. The Ordovician conodontSemiacontiodus cornuformis (Sergeeva, 1963) and related species in Baltoscandia. - Geologica et Palaeontologica.Google Scholar
  45. McCracken, A. D. 1991. Taxonomy and biostratigraphy of Llandovery (Silurian) conodonts in the Canadian Cordillera, northern Yukon Territory. -[In:]Orchard, M. J. & McCracken, A. D. [eds.] Ordovician to Triassic conodont paleontology of the Canadian Cordillera. - Geological Survey of Canada Bulletin417: 65–95. Ottawa.Google Scholar
  46. McCracken, A. D. &Barnes, C. R. 1981. Conodont biostratigraphy and paleoecology of the Ellis Bay Formation, Anticosti Island, Quebec, with special reference to Late Ordovician - Early Silurian chronostratigraphy and the systemic boundary. - Geological Survey of Canada Bulletin 329(2): 51–134, Ottawa.Google Scholar
  47. McTavish, R. A. &Legg, D. P. 1976. The Ordovician of the Canning Basin, Western Australia. - [In:]Bassett, M. G. [ed.] The Ordovician System: proceedings of a Palaeontological Association symposium, Birmingham, September 1974: 447–478, Cardiff (University of Wales Press and National Museum of Wales).Google Scholar
  48. Moskalenko, T. A. 1970. Konodonti Krivolutskogo jarusa (Srednij Ordovik) Sibirskoj platformi. -116 pp., Moskva (“NAUKA”).Google Scholar
  49. Nicoll, R. S. 1990. The genusCordylodus and latest Cambrian-earliest Ordovician conodont biostratigraphy. - BMR Journal of Australian Geology & Geophysics11: 529–558, Canberra.Google Scholar
  50. — 1994. Seximembrate apparatus structure of the Late Cambrian coniform conodontTeridontus nakamurai from the Chatsworth Limestone, Georgina Basin, Queensland. - BMR Journal of Australian Geology & Geophysics15: 367–379, Canberra.Google Scholar
  51. — 1995. Conodont element morphology, apparatus reconstructions and element function: a new interpretation of conodont biology with taxonomic implications. - Courier Forschungsinstitut Senckenberg182: 247–262, Frankfurt am Main.Google Scholar
  52. Nogami, Y. 1967. Kambrische Conodonten von China, Teil 2. Conodonten aus den hoch oberkambrischen Yencho-Schichten. -Memoirs of the College of Science, University of Kyoto, Series B, Geology and Mineralogy33: 211–218, 3 text-figs., 1 pl., Kyoto.Google Scholar
  53. Nowlan, G. S. 1981. Some Ordovician conodont faunules from the Miramichi Anticlinorium, New Brunswick. - Geological Survey of Canada Bulletin345: 1–35, Ottawa.Google Scholar
  54. Nowlan, G. S.;McCracken, A. D. &Chatterton, B. D. E. 1988. Conodonts from the Ordovician -Silurian boundary strata, Whittaker Formation, Mackenzie Mountains, Northwest Territories. - Geological Survey of Canada Bulletin373: 1–99, Ottawa.Google Scholar
  55. Ortega, G.;Albanesi, G. L. &Hünicken, M. A. 1995. Bioestratigrafia en base a conodontes y graptolitos de las Formaciones San Juan (Techo) y Gualcamayo (Arenigiano-Llanvirniano) en el Cerro Potrerillo, Precordillera de San Juan, Argentina. - Boletin de la Academia Nacional de Ciencias, Cordoba/Argentina60: 317–364, Cordoba.Google Scholar
  56. Pander, C. H. 1856. Monographie der fossilen Fische des Silurischen Systems der Russisch-Baltischen Gouvernements. - i-x, 1–91, St. Petersburg (Akademie der Wissenschaften).Google Scholar
  57. Repetski, J. E. 1982. Conodonts from El Paso Group (Lower Ordovician) of westernmost Texas and southern New Mexico. - New Mexico Bureau of Mines and Mineral Resources, Memoir40: 1–120, Socorro/ New Mexico.Google Scholar
  58. Rexroad, C. B. 1967. Stratigraphy and conodont paleontology of the Brassfield (Silurian) in the Cincinnati Arch area. -Indiana Geological Survey Bulletin36: 1–69, Bloomington/Indiana.Google Scholar
  59. Rhodes, F H. T. 1955. The conodont fauna of the Keisley Limestone. - Geological Society of London, Quarterly Journal111: 117–142, London.CrossRefGoogle Scholar
  60. Sansom, I. J.;Armstrong, H. A. &Smith, M. P. 1995. The apparatus architecture ofPanderodus and its implications for coniform conodont classification. - Palaeontology37: 781–799, London.Google Scholar
  61. Sergeeva, S. P. 1963. Konodontij iz niznego ordovika Leningradskoj oblasti. [Conodonts from the Lower Ordovician in the Leningrad region]. - Paleontologicheskij Zhurnal1963: 93–108, Moskva (Akademia Nauk SSSR). - [In Russian].Google Scholar
  62. Serpagli, E. 1967. I conodonti dell’Ordoviciano superiore (Ashgilliano) delle Alpi Carniche. - Bolletino della Società Paleontologica Italiana6: 1–111, Modena.Google Scholar
  63. Smith, M. P. 1991. Early Ordovician conodonts of East and North Greenland. - Meddelelser om Grønland. - Geoscience26: 1–81, København.Google Scholar
  64. Smith, M. P.;Briggs, D. E. G. &Aldridge, R. J. 1987. A conodont animal from the lower Silurian of Wisconsin, USA, and the apparatus architecture of panderodontid conodonts. - [In:]Aldridge, R. J. [ed.] Palaeobiology of conodonts: 91–104, Chichester (Ellis Horwood Limited).Google Scholar
  65. Stait, K. &Druce, E. C. 1993. Conodonts from the Lower Ordovician Coolibah Formation, Georgina Basin, central Australia. - BMR Journal of Australian Geology and Geophysics13: 293–322, Canberra.Google Scholar
  66. Stouge, S. &Bagnoli, G. 1988. Early Ordovician Conodonts from Cow Head Peninsula, western Newfoundland. -Palaeontographia Italica75: 89–179, Pisa.Google Scholar
  67. — 1990. Lower Ordovician (Volkhovian-Kundan) conodonts from Hagudden, northern Öland, Sweden. - Palaeontographia Italica77: 1–54, Pisa.Google Scholar
  68. Sweet, W. C. 1979. Late Ordovician conodonts and biostratigraphy of the Western Midcontinent Province. - [In:]Sandberg, C. A. & Clark, D. L. [eds.] Conodont biostratigraphy of the Great Basin and Rocky Mountains. - Brigham Young University Geology Studies26: 45–74, Provo/ Utah.Google Scholar
  69. — 1988. The Conodonta. Morphology, taxonomy, paleoecology and evolutionary history of a long-extinct animal Phylum. - 212 pp., New York (Oxford University Press).Google Scholar
  70. Sweet, W. C. &Schönlaub, H. P. 1975. Conodonts of the genusOulodusBranson & Mehl, 1933.- Geologica et Palaeontologica9: 41–59, Marburg.Google Scholar
  71. Szaniawski, H. 1980. Conodonts from the Tremadocian chalcedony beds, Holy Cross Mountains (Poland). - Acta Palaeontologica Polonica25: 101–121, Warszawa.Google Scholar
  72. Tjernvik, T. 1956. On the Early Ordovician of Sweden - stratigraphy and fauna. - Bulletin of the Geological Institutions of the University of Uppsala36: 107–284, Uppsala.Google Scholar
  73. Uyeno, T. T. &Barnes, C. R. 1983. Conodonts of the Jupiter and Chicotte Formations (Lower Silurian), Anticosti Island, Quebec. - Geological Survey of Canada Bulletin355: 1–49, Ottawa.Google Scholar
  74. van Wamel, W. A. 1974. Conodont biostratigraphy of the Upper Cambrian and Lower Ordovician of north-western Öland, south-eastern Sweden. - Utrecht Micropaleontological Bulletin10: 1–126, Utrecht.Google Scholar
  75. Viira, V. 1967. Ordovikskie konodonty iz skvazhiny Ohesaare. [Ordovician conodont succession in the Ohesaare core.] - Eesti NSV Teaduste Akadeemia Toimetised. Keemia - Geoloogia16: 319–329, Tallinn.Google Scholar
  76. — 1974. Konodonty Ordovika Pribaltiki [Ordovician conodonts of the east Baltic]. - 142 pp., Tallinn (“Valgus”).Google Scholar
  77. Zhang Jianhua 1998. Conodonts from the Guniutan Formation (Llanvirnian) in Hubei and Hunan Provinces, southcentral China. -Stockholm Contributions in Geology46: 1–161, Stockholm.Google Scholar

Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 1998

Authors and Affiliations

  • Anita Löfgren
    • 1
  1. 1.Department of GeologyLund UniversityLundSweden

Personalised recommendations