Abstract
A new morphotype of multicuspid teeth belonging to the actinopterygian order Eurynotoidiformes and supposedly associated with Isadia opokiensis A. Minich et Andrushkevich, 2017 was found in the terminal deposits of the East European Severodvinian Stage (Maryushkina Sluda-C locality, Vologda Region). The original description of this species was based upon isolated scales obtained from the stratigraphically and geographically adjacent Mutovino locality. Teeth of the I. opokiensis morphotype are robust and are characterized by a powerful buttress and a wide crown bearing numerous (up to eight) spade-shaped cusps with high acrodine caps. Cusp tips form a slightly curved occlusal surface. Labially, these tips bear well defined facets formed by lifetime wear that suggest algal scraping as the predominant feeding mode. Tooth structure in Isadia opokiensis is morphologically transitional between that of I. suchonensis and I. arefievi, suggesting a morphoevolutionary succession. The similar (flat) crown shape in another Isadia species, I. aristoviensis, may have originated convergently by modification of a more primitive morphotype found in Urzhumian eurynotoidids.
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REFERENCES
Arefiev, M.P., Golubev, V.K., Balabanov, Yu.P., Karasev, E.V., Minikh, A.V., Minikh, M.G., Molostovskaya, I.I., Yaro-shenko, O.P., and Zhokina-Naumcheva M.A., Type and reference sections of the Permian–Triassic continental sequences of the East European Platform: main isotope, magnetic, and biotic events. Sukhona and Severnaya Dvina Rivers field trip (XVIII Int. Congr. on the Carboniferous and Permian), Moscow: Paleontol. Inst. Ross. Akad. Nauk, 2015.
Bellwood, D.R., Origins and escalation of herbivory in fishes: a functional perspective, Paleobiology, 2003, vol. 29, pp. 71–83.
Bellwood, D.R., Hoey, A.S., Bellwood, O. and Goatley, C.H.R., Evolution of long–toothed fishes and the changing nature of fish–benthos interactions on coral reefs, Nature Commun., 2014, no. 5, pp. 31–44.
Bulanov, V.V. and Minikh, A.V., Convergent morphogenesis of the dentition in tetrapods and actinopterygians of Middle–Late Permian of Eastern Europe, Mater. konf. “Morfogenez v individual’nom i istoricheskom razvitii: ontogenez i formirovanie biologicheskogo raznoobrazija” (Proc. Conf. “Morphogenesis in Individual and Historical Development: Ontogeny and the Formation of Biological Diversity”), Moscow: Paleontol. Inst. Ross. Akad. Nauk, 2017, pp. 9–11.
Dieleman, J., Van Bocxlaer, B., Manntschke, C., Wanja Nyingi, D., Adriaens, D., and Verschuren, D., Tracing functional adaptation in African cichlid fishes through morphometric analysis of fossil teeth: exploring the methods, Hydrobiologia, 2015, vol. 755, no. 1, pp. 73–88.
Eichwald, E., Paleontologiya Rossii. Drevnii period. Ch. II. Fauna grauvakkovoi, gornoizvestkovoi i medistoslantsevoi formatsii Rossii (Paleontology of Russia. The Ancient Period. Pt. 2. The Fauna of the Greywacke, the Rock Lime and the Copper Shale Formations of Russia), St. Petersburg, 1861.
Esin, D.N., The scale cover of Amblypterina costata (Eichwald) and the palaeoniscid taxonomy based on isolated scales, Paleontol. Zh., 1990, no. 2, pp. 89–96.
Esin, D.N., Peculiarities of the trophic orientation changes in Palaeoniscoid assemblages from the Upper Permian of the European part of Russia, Modern Geol., 1997, vol. 21, no. 1, pp. 185–195.
Golubev, V.K., Permskie i triasovye khroniozukhii i biostratigrafiya verkhnetatarskikh otlozhenii Vostochnoi Evropy po tetrapodam (Permian and Triassic Chroniosuchids and the Biostratigraphy of upper Tatarian deposits of Eastern Europe from Tetrapods), Tr. Paleontol Inst. Ross. Akad. Nauk, vol. 276, Moscow: Nauka, 2000, pp. 1–174.
Ivakhnenko, M.F., Permian Cynodontia (Theromorpha) of Eastern Europe, Paleontol. J., 2012, vol. 46, no. 2, pp. 199–207.
Ivakhnenko, M.F., Golubev, V.K., Gubin, Yu.M., Kalandadze, N.N., Novikov, I.V., Sennikov, A.G., and Rautian, A.S., Permskie i triasovye tetrapody Vostochnoi Evropy (Permian and Triassic Tetrapods of Eastern Europe), Tr. Paleont. Inst. Ross. Akad. Nauk, vol. 268, Moscow: GEOS, 1997.
Minikh, A.V., A new paleoniscid genus from the Late Permian of the Southern Urals, Available from VINITI, No. 2837-B (Saratov, 1986).
Minikh, A.V. and Andrushkevich, S.O., A new species of actinopterygian fish from the Upper Permian of the Moscow syncline, Izv. Saratov. Univ. Nov. Ser., Ser. Nauki o Zemle, 2017, vol. 17., no. 2, pp. 100–105.
Minikh, A.V. and Minikh, M.G., A revision of several paleoniscids and new fishes from the Upper Permian of the Eastern European Platform and the prospects of their use in stratigraphy, Voprosy geologii Yuzhnogo Urala i Nizhnego Povolzh’ya (Geology of the Southern Urals and the Lower Volga), Aleshechkin, O.I., Ed., Saratov: Saratov. Univ., 1990, pp. 84–104.
Minikh, A.V. and Minikh, M.G., Ikhtiofauna permi Evropeiskoi Rossii (The Ichthyofauna of the Permian of European Russia), Saratov: Nauka, 2009.
Minikh, A.V., Arefiev, M.P., and Golubev, V.K., A new fish species of the genus Isadia (Actinopterygii, Eurynotoidiformes) from the new locality on the Malaya Northern Dvina River (terminal Permian, Vologda Region), Paleontol. J., 2015, vol. 49, no. 6, pp. 615–626.
Pindakiewicz, M., Tałanda, M., Sulej, T., Niedźwiedzki, G., Sennikov, A.G., Bakaev, A.S., Bulanov, V.V., Golubev, V.K., and Minikh, A.V., Feeding convergence among ray-finned fishes: Teeth of the herbivorous actinopterygians from the latest Permian of East European Platform, Russia, Acta Palaeontol. Pol., 2020, vol. 65. https://doi.org/10.4202/app.00620.2019
Purnell, M., Seehausen, O., and Galis, F., Quantitative three-dimensional microtextural analyses of tooth wear as a tool for dietary discrimination in fishes, J. R. Soc. Interface, 2012, vol. 9, pp. 2225–2233.
Yamaoka, K., Feeding behaviour and dental morphology of algae scraping cichlids (Pisces: Teleostei) in Lake Tanganyika, Afr. Study Monogr., 1983, vol. 4, pp. 77–89.
ACKNOWLEDGMENTS
The author thanks O.A. Lebedev, E.K. Sytchevskaya for help in the preparation of the manuscript and M.A. Naumcheva for collecting and preparing valuable comparative material.
Funding
The study was supported by Russian Foundation for Basic Research, project nos. 19-34-90040.
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Translated by D. Ponomarenko
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Bakaev, A.S. A New Morphotype of Fish Teeth of the Order Eurynotoidiformes (Actinopterygii) from the Upper Permian Deposits of European Russia. Paleontol. J. 54, 171–179 (2020). https://doi.org/10.1134/S0031030120020033
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DOI: https://doi.org/10.1134/S0031030120020033