Ptychotrygon aff. blainensis
Case, 1978
Classification: Elasmobranchii Rajiformes Ptychotrygonidae
Reference of the original description
A new selachian fauna from the Judith River Formation (Campanian) of Montana. Palaeontographica, Abt. A, 160(1–6), 176–205
A new selachian fauna from the Judith River Formation (Campanian) of Montana. Palaeontographica, Abt. A, 160(1–6), 176–205
Types
Ptychotrygon aff. blainensis
Ptychotrygon aff. blainensis
Description:
Citation: Ptychotrygon aff. blainensis Case, 1978: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 11/2025
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Description
Original diagnosis after Case (1978) p. 197 [388]: Teeth of small size, crown greater in length than width, with high cuspidate crown, bearing two transversally positioned ridges in the direction of the internal (lingual) aspect (cf. Text-fig. 16b). The forward ridge outlining a convex area on the lingual face of the crown, while the main ridge separates the internal view at the apex of the crown from the occlusal face of the tooth enameloid.
Original diagnosis after Case (1978) p. 197 [388]: Teeth of small size, crown greater in length than width, with high cuspidate crown, bearing two transversally positioned ridges in the direction of the internal (lingual) aspect (cf. Text-fig. 16b). The forward ridge outlining a convex area on the lingual face of the crown, while the main ridge separates the internal view at the apex of the crown from the occlusal face of the tooth enameloid.
Remarks
shark-references Species-ID=10227;
shark-references Species-ID=10227;
References
Additions aux faunes de sélaciens du Crétacé du Texas (Albien supérieur-Campanien). Palaeo Ichthyologica, 9, 5–111
Additions aux faunes de sélaciens du Crétacé du Texas (Albien supérieur-Campanien). Palaeo Ichthyologica, 9, 5–111
