Ptychotrygon blainensis

Case, 1978


Classification: Elasmobranchii Rajiformes Ptychotrygonidae

Reference of the original description
Case, G.R. (1978)
A new selachian fauna from the Judith River Formation (Campanian) of Montana. Palaeontographica, Abt. A, 160(1–6), 176–205

Synonyms / new combinations and misspellings
Ptychotrygon aff. blainensis, Ptychotrygon cf. blainensis

Types
Ptychotrygon blainensis
Holotype: USTL: MTA 33; Paratype: USTL: MTA 34a; USTL: MTA 34b; USTL: MTA 34c; USTL: MTA 35;


Description:


Citation: Ptychotrygon blainensis Case, 1978: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 01/2023

No image available.
Please send your images of "Ptychotrygon blainensis" to
info@shark-references.com

Description
Original diagnose 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
valid after Case (1978) p. 197 [388];


References
Brinkman, D.B. & Braman, D.R. & Neuman, A.G. & Ralrick, P.E. & Sato, T. (2005)
A Vertebrate Assemblage from the Marine Shales of the Lethbridge Coal Zone. In P. J. Currie and E. B. Koppelhus(eds.) Dinosaur Provincial Park, A spectacular ancient ecosystem revealed. Indiana University Press, Bloomington and Indianapolis, Indiana: 486–500
Cappetta, H. & Case, G.R. (1999)
Additions aux faunes de sélaciens du Crétacé du Texas (Albien supérieur-Campanien). Palaeo Ichthyologica, 9, 5–111
Beavan, N.R. & Russell, A.P. (1999)
An elasmobranch assemblage from the terrestrial-marine transitional Lethbridge Coal Zone (Dinosaur Park Formation: Upper Campanian), Alberta, Canada. Journal of Paleontology, 73(3), 494–503
Case, G.R. (1978)
A new selachian fauna from the Judith River Formation (Campanian) of Montana. Palaeontographica, Abt. A, 160(1–6), 176–205