Biology:Anotodus

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Anotodus (meaning "Tooth without posterior part") is an extinct dubious genus of thresher sharks that lived during the Neogene. The type species, is the A. agassizii, now considered a nomen dubium, why it was described from very fragmentary fossils, and are not sufficient to distinguish it from A. retroflexus, now considered the only valid species if Anotodus is a distinct genus. He has been found in North America, South America, Europe, and Australia.[1][2]

An additional species, Oxyrhina complanata was recent reclassified in the same genus and replaced as A. complanatus or A. complanata.[citation needed] Now, recent studies have classified Anotodus as an invalid taxon, and potential junior synonym of the Isurus retroflexus, an extinct mako shark, but a recent studie of Szabó in 2021 suggested that Anotodus is a distinct genus related to Thresher sharks.

Taxonomy

Oxyrhina retroflexa was named by Louis Agassiz in an 1838 illustration,[3] which was followed by his text description in 1843.[4][lower-alpha 1] Its holotype is a tooth of unknown provenance housed in the State Museum of Natural History, Karlsruhe.[3][4] In 1871, Henri Le Hon named Anotodus agassizii for teeth from the Pliocene of Belgium, while acknowledging that it could be the same as O. retroflexa.[6] The former species is now regarded as a junior synonym of the latter; while some authors consider it to belong to Isurus,[7] it is more widely accepted as a distinct genus of alopiid.[1][2][8]

Notes

  1. ↑ The publication dates are based on Brignon (2014).[5]

References

  1. ↑ 1.0 1.1 Cappetta, H. (2012). Handbook of Paleoichthyology. Volume 3E. Chondrichthyes. Mesozoic and Cenozoic Elasmobranchii: Teeth.. Munich, DE: Verlag Dr. Friedrich Pfeil. pp. 242–243. ISBN 978-3-89937-148-2. 
  2. ↑ 2.0 2.1 Carrillo-Briceño, J.D.; Luz, Z.; Hendy, A.; Kocsis, L.; Aguilera, O.; Vennemann, T. (2019). "Neogene Caribbean elasmobranchs: diversity, paleoecology and paleoenvironmental significance of the Cocinetas Basin assemblage (Guajira Peninsula, Colombia)". Biogeosciences 16 (1): 33–56. doi:10.5194/bg-16-33-2019. Bibcode: 2019BGeo...16...33D. 
  3. ↑ 3.0 3.1 Cite error: Invalid <ref> tag; no text was provided for refs named Agassiz 1838
  4. ↑ 4.0 4.1 Agassiz, J.L.R. (1837–1843). Recherches sur les poissons fossiles. Tome III. Neuchâtel, CH & Soleure, CH: Petitpierre & Jent et Gassmann. p. 281. doi:10.5962/bhl.title.4275. 
  5. ↑ Brignon, A. (2014). "The paleoichthyological and geological researches on the Permian deposits of Muse near Autun (Saône-et-Loire, France) at the beginning of the XIXth century". Bulletin de la Société géologique de France 185 (4): 233–252. doi:10.2113/gssgfbull.185.4.233. https://www.researchgate.net/publication/264193971. 
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Le Hon 1871
  7. ↑ Kent, B.W. (2018). "The cartilaginous fishes (chimaeras, sharks, and rays) of Calvert Cliffs, Maryland". in Godfrey, S.J.. The Geology and Vertebrate Paleontology of Calvert Cliffs, Maryland, USA. Smithsonian Contributions to Paleobiology. Number 100. Washington, DC: Smithsonian Institution Scholarly Press. pp. 45–157. doi:10.5479/SI.1943-6688.100. 
  8. ↑ Szabó, M.; Kocsis, L.; Bosnakoff, M.; Sebe, K. (2021). "A diverse Miocene fish assemblage (Chondrichthyes and Osteichthyes) from the Pécs-Danitzpuszta sand pit (Mecsek Mts, Hungary)". Földtani Közlöny 151 (4): 363–410. doi:10.23928/foldt.kozl.2021.151.4.363. 

Further reading

  • J. Herman. 1977. Les sélaciens des terrains néocrétacés and paléocènes de Belgique and des contrées limitrophes. Eléments d'une biostratigraphie intercontinentale. Mémoires pour Servir a l'Explication des Cartes Géologiques et Minières de la Belgique 15:1-450

Wikidata ☰ Q127500539 entry



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