Biology:Caseodus
Caseodus is an extinct genus of eugeneodont from the Carboniferous of what is now the Midwestern United States,[1] and potentially the Early Triassic of what is now British Columbia, Canada.[2] The genus contains two Carboniferous species, C. basalis and C. eatoni, which are differentiated by the anatomy of their teeth but are otherwise identical.[1][3] A third species, C. varidentis, is known from the Early Triassic Sulphur Mountain Formation,[2] but due to its wildly different skull and tooth morphology it is questionable if it belongs in the genus.[4] The genus name is in honor of paleoichthyologist Gerard Case,[1] and the type species was originally placed in the genus Orodus.[3][5]
All species in the genus grew to approximately 1–1.5 m (3.3–4.9 ft) in length.[1][2][3] The Carboniferous species had upper jaws which supported teeth and a row of fused teeth (termed a tooth-whorl) along the midline of the lower jaw.[1][4] The Triassic species entirely lacked upper jaws and had an elongated projection, termed a rostrum, which extended from the lower jaw and supported the lower tooth-whorl.[4] Caseodus varidentis (if included in the genus) is one of the few eugeneodontid genera that survived the end-Permian mass extinction event, and is one of the last surviving genera of this clade.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 R., Zangerl (1981). Handbook of paleoichthyology. 3A. Chondrichthyes I (Paleozoic elasmobranchii). Gustav Fischer. ISBN 3-437-30337-6. OCLC 1116152115.
- ↑ 2.0 2.1 2.2 2.3 Mutter R.J., Neuman A.G. (2008): New eugeneodontid sharks from the Lower Triassic Sulphur Mountain Formation of Western Canada. In: Fishes and the Break-up of Pangaea. Cavin L, Longbottom A, Richter M, editors. Geol Soc London Spec Publ 295: 941
- ↑ 3.0 3.1 3.2 Ginter, Michał; Hampe, Oliver; Duffin, Christopher J. (2010). Handbook of paleoichthyology: teeth. München: F. Pfeil. pp. 118. ISBN 978-3-89937-116-1.
- ↑ 4.0 4.1 4.2 Mutter, Raoul J.; Neuman, Andrew G. (2008-06-10). "Jaws and dentition in an Early Triassic, 3-dimensionally preserved eugeneodontid skull (Chondrichthyes)" (in en). Acta Geologica Polonica 58 (2): 223–227. https://geojournals.pgi.gov.pl/agp/article/view/10007.
- ↑ Cope, E. D. (1894). New and little known Paleozoic and Mesozoic fishes. ser.2:v.9 (1884-1895). Philadelphia: Academy of Natural Sciences of Philadelphia. pp. 427-448. https://www.biodiversitylibrary.org/item/224106.
Wikidata ☰ Q5048412 entry
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