Ptychodus maghrebianus

Amadori, Kindlimann, Fornaciari, Giusberti & Kriwet, 2022


Classification: Elasmobranchii incertae sedis Ptychodontidae

Reference of the original description
Amadori, M. & Kindlimann, R. & Fornaciari, E. & Giusberti, L. & Kriwet, J. (2022)
A new cuspidate ptychodontid shark (Chondrichthyes; Elasmobranchii), from the Upper Cretaceous of Morocco with comments on tooth functionalities and replacement patterns. Journal of African Earth Sciences, 187, Article 104440

Types
Ptychodus maghrebianus
Holotype: PIMUZ: A/I 5056;


Description:


Citation: Ptychodus maghrebianus Amadori, Kindlimann, Fornaciari, Giusberti & Kriwet, 2022: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 02/2023

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Description
Original diagnose after Amadori et al. (2022) p. 92 [30434]: A species of †Ptychodus only known by the lower dental plate with the following dental features: tooth crowns rectangular and bulgy with a rounded and ticked cusp crossed by irregular and fine ridges radiating from the tooth central area. Each radial ridge subsequently branches basally into numerous thinning ridges gradually forming a dense, random granular pattern on the well-developed marginal areas, not following a diagnostic design. Cusp covers almost entire occlusal surface, extending to the tooth edges in symphyseal teeth. Mesial edge of lateral teeth displays an additional lowered area. Both anterior protuberance and posterior sulcus poorly developed. Root massive and bilobate, with shallow antero-posterior sulcus. Tooth outline becomes increasingly asymmetrical mesio-distally with a transversally elongated and parallelogram-shaped dental crown. Cusp almost completely reduced in distalmost teeth.

Remarks
valid after Amadori et al. (2022) p. 7 [30434];


References
Amadori, M. & Kindlimann, R. & Fornaciari, E. & Giusberti, L. & Kriwet, J. (2022)
A new cuspidate ptychodontid shark (Chondrichthyes; Elasmobranchii), from the Upper Cretaceous of Morocco with comments on tooth functionalities and replacement patterns. Journal of African Earth Sciences, 187, Article 104440
DOI: 10.1016/j.jafrearsci.2021.104440