Campodus

{{Short description|Extinct genus of sharks}}

{{Automatic taxobox

| fossil_range = Carboniferous, {{fossilrange|Visean|Bashkirian}}

| image = Campodus sp.jpg

| image_caption = Life restoration

| taxon = Campodus

| authority = Koninck, 1844

| subdivision_ranks = Species

| subdivision_ref =

| subdivision = {{species list

| C. agassizianus | Koninck, 1844

| C. corrugatus | Newberry and Worthen, 1870

| C. scitulus | Saint John and Worthen, 1875

| C. virginianus | Saint John and Worthen, 1875 }}

}}

Campodus is an extinct genus of eugeneodont holocephalans from the Carboniferous.{{cite book

|title = Bibliography and Catalogue of the Fossil Vertebrata of North America

|series = Bulletin of the United States Geological Survey

|volume = 179

|first = O.P.

|last1 = Hay

|url = https://www.biodiversitylibrary.org/bibliography/20094#/summary

|date = 1902}} Likely one of the earliest and most basal caseodontoids, it can be characterized by its broad, ridge-ornamented crushing teeth made of various types of dentine. The type species, C. agassizianus, was originally described in 1844 based on a small number of teeth from the Namurian of Belgium.{{Cite journal|last=Ginter|first=Michał|date=2018|title=The dentition of a eugeneodontiform shark from the Lower Pennsylvanian of Derbyshire, UK|url=http://www.app.pan.pl/archive/published/app63/app005332018.pdf|journal=Acta Palaeontologica Polonica|volume=63|issue=4|pages=725–735|doi=10.4202/app.00533.2018|doi-access=free}}

Additional fossils have been referred to the genus. These include Belgian specimens referred by Lohest (1884), fossils from Missouri referred by Zangerl (1981), and symphyseal tooth-whorls from Nebraska and Kansas referred by Eastman (1902).{{Cite book|last=Zangerl|first=R.|title=Chondrichthyes I – Paleozoic Elasmobranchii|publisher=Gustav Fischer Verlag|year=1981|series=Handbook of Paleoichthyology|location=Stuttgart|pages=i–iii, 1–115}} The tooth whorls were given their own species, C. variabilis. They shared some similarity to a massive "Agassizodus" jaw apparatus found in Osage, Kansas and described by St. John & Worthen (1875). This has led some authors to the conclusion that Agassizodus and Campodus were synonyms.{{Cite journal|last=Eaton|first=Theodore H.|date=1 October 1962|title=Teeth of Edestid Sharks|url=https://www.biodiversitylibrary.org/page/4392898#page/389/mode/1up|journal=University of Kansas Publications, Museum of Natural History|volume=12|issue=8|pages=347–362}} However, others note that clearly identifiable Campodus teeth have not been found in the same areas from which Agassizodus was originally described. Ginter (2018) concluded that Eastman's "C. variabilis" and St. John & Worthen (1875)'s "Agassizodus" belonged to neither Campodus nor Agassizodus, and instead represented a new unnamed genus. Ginter additionally referred a specimen from Derbyshire, England to Campodus agassizianus.