Strigilodus Tollesonae
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''Strigilodus'' is an extinct
genus Genus (; : genera ) is a taxonomic rank above species and below family (taxonomy), family as used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In bino ...
of
cartilaginous fish Chondrichthyes (; ) is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage. They can be contrasted with the Osteichthyes or ''bony fish'', which have skeleto ...
within the order
Petalodontiformes Petalodontiformes ("thin-plate teeth") is an extinct order of marine cartilaginous fish related to modern day chimaera found in what is now the United States of America and Europe.Lund, Richard, E. D. Grogan, and M. Fath. "On the relationships of ...
. This genus existed during the Lower Carboniferous period, approximately 350 million years ago. The genus was identified in 2023 from
fossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserve ...
ized teeth found in the Ste. Genevieve Formation rock layer at
Mammoth Cave National Park Mammoth Cave National Park is a national park of the United States in south-central Kentucky. It encompasses portions of Mammoth Cave, the longest known cave system in the world. The park's are located primarily in Edmonson County, with sma ...
in
Kentucky Kentucky (, ), officially the Commonwealth of Kentucky, is a landlocked U.S. state, state in the Southeastern United States, Southeastern region of the United States. It borders Illinois, Indiana, and Ohio to the north, West Virginia to the ...
, the United States. The distinctive teeth, arranged in a fan-like structure, featured a large tooth in the center and three smaller teeth alongside it. Each tooth had a rounded curved cusp for clipping and grasping hard shell prey, with ridges on the inner side for crushing.


Species

The genus contains 1 known species: * ''Strigilodus tollesonae'' (Hodnett, Toomey, Olson, Tweet & Santucci, 2023)


See also

* ''
Janassa ''Janassa'' is an extinct genus of petalodont cartilaginous fish that lived in marine environments in what is now central United States of America and Europe during the Carboniferous and upper Permian. It is known from teeth and a few poorly ...
'' * ''
Belantsea ''Belantsea'' (named after a legendary ancestor of the Crow people, Crow Tribe) is a genus of extinct petalodontiformes, petalodontiform cartilaginous fish that lived during the Carboniferous, Early Carboniferous. Fossils of ''Belantsea montana'' ...
''


References

{{Taxonbar, from=Q123265993 Petalodontiformes