Peripristis is a monotypic genus of fish known from Carboniferous rocks, belonging to the Pristodontidae Woodward, 1889. It could be called a form genus, as only isolated teeth are known today. The species semicircularis derives from its curved nature, which represents a portion of a circle. Ginter (2010) and Lund (1989) state that teeth of the Pristodontidae allegedly have denticulate teeth in the upper jaw and lack denticulations in the lower. While some believe they can contrast the top and bottom teeth, Ginter calls the bottom teeth “presumed” and that they have triangular crowns with few to no cusps. If this holds, the specimen below is from the top of the mouth.

CG-0648—Four views of Peripristis semicircularis from the Pine Creek limestone in Brooke County, West Virginia. The top two views are labial, and the bottom right is lingual. The lingual view is interesting because it has a highly modified basal ridge which likely helped to secure the tooth.

Newberry (1875, page 52) reported a tooth from Adams Township, Muskingum County, Ohio. He found the specimen less arched than most but not so much as to separate it from the species. Its known locations included the Carboniferous Limestone of Armagh, Ireland, and Indiana and Illinois in the United States. He placed it under Ctenoptychius rather than Peripristis because they found them synonymous, and the former was the older name.

Ctenoptychius semicircular (=Peripristis semicircularis), plate 58, figure 14 from Newberry 1875.

Newberry discusses a second tooth from the city of Pittsburgh, Pennsylvania. It was a partial crown, said to be flatter than C. semicircularis, with larger symmetrically lance-shaped denticles and covered with fine wrinkles.


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