Ptychodus maghrebianus
Amadori, Kindlimann, Fornaciari, Giusberti & Kriwet, 2022
Classification: Elasmobranchii incert. sedis Ptychodontidae
Reference of the original description
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
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
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 12/2024
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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.
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.
References
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
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
