Biology:Agassizodus
| Agassizodus | |
|---|---|
| |
| Fossil tooth whorl | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Holocephali |
| Order: | †Eugeneodontida |
| Family: | †Helicoprionidae |
| Genus: | †Agassizodus St. John and Worthen 1875 |
| Type species | |
| †Agassizodus variabilis Newberry and Worthen, 1870
| |
Agassizodus is an extinct genus of eugeneodont holocephalian from the Carboniferous. It belongs to the family Helicoprionidae, which is sometimes called Agassizodontidae. Like other members of its family, it possessed a symphyseal tooth whorl, which was likely present at the tip of the lower jaw and associated with lateral crushing toothplates.[1] The type species, A. variabilis, was originally named Lophodus variabilis until the name "Lophodus" was determined to be preoccupied.[2]
A. variabilis was originally based on tooth fragments from the Pennsylvanian of Illinois, but the authors who named the genus (St. John and Worthen, 1875) also referred a massive jaw from Osage County, Kansas. The Osage jaw shared some similarities to tooth-whorls from the area, which were later described by Eastman (1902). Eastman concluded that the tooth whorls and jaw belonged to Campodus, so he renamed Agassizodus variabilis to Campodus variabilis.[2] Other authors disagree, arguing that the Eastman specimens and the Osage jaw represent neither Agassizodus or Campodus, but rather an entirely new genus.[3][4]
References
- ↑ Tapanila, Leif; Pruitt, Jesse; Wilga, Cheryl D.; Pradel, Alan (2020). "Saws, Scissors, and Sharks: Late Paleozoic Experimentation with Symphyseal Dentition" (in en). The Anatomical Record 303 (2): 363–376. doi:10.1002/ar.24046. ISSN 1932-8494. PMID 30536888.
- ↑ 2.0 2.1 Eaton, Theodore H. (1 October 1962). "Teeth of Edestid Sharks". University of Kansas Publications, Museum of Natural History 12 (8): 347–362. https://www.biodiversitylibrary.org/page/4392898#page/389/mode/1up.
- ↑ Zangerl, R. (1981). Chondrichthyes I – Paleozoic Elasmobranchii. Handbook of Paleoichthyology. Stuttgart: Gustav Fischer Verlag. pp. i–iii, 1–115.
- ↑ Ginter, Michał (2018). "The dentition of a eugeneodontiform shark from the Lower Pennsylvanian of Derbyshire, UK". Acta Palaeontologica Polonica 63 (4): 725–735. doi:10.4202/app.00533.2018. http://www.app.pan.pl/archive/published/app63/app005332018.pdf.
Wikidata ☰ Q105702004 entry
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