Eorapax serrasis
Saugen, Roberts, Engelschion & Hurum, 2024
Classification: Elasmobranchii incert. sedis incert. fam.
Reference of the original description
A new assemblage of Lower Triassic neoselachians (Chondrichthyes) from the Grippia Bonebed of Spitsbergen, Norway. Journal of Vertebrate Paleontology, 44(3), Article e2426544
A new assemblage of Lower Triassic neoselachians (Chondrichthyes) from the Grippia Bonebed of Spitsbergen, Norway. Journal of Vertebrate Paleontology, 44(3), Article e2426544
Description:
Citation: Eorapax serrasis Saugen, Roberts, Engelschion & Hurum, 2024: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 08/2026
Description
Original diagnosis after Saugen, Roberts, Engelschion & Hurum, 2024 [34071]: Eorapax serrasis, based on isolated teeth, possess the following unique character combinations: Monocuspid (unlike Synechodontiformes and Hexanchiformes (except Sphenodus) that are multicuspids); minute vertical crests at the base of the crown and a strong transverse crest on the lingual face; lingually inclined cusp (differs from the sigmoidal cusp in Sphenodus); serrated cutting edge (different from the sharp cutting edge in Synechodus, Safrodus, Grozonodon, and Mucrovenator, and blunt in Wimanodon and Rhomphaiodon); anaulacorhizy to pseudopolyaulacorhizy root vascularization pattern (compared with anaulacorhizy in Grozonodon and Sphenodus, pseudopolyaulacorhizy in Synechodontiformes and Hexanchiformes); pseudoosteodont; enameloid includes SCE, PBE, TBE, and RBE (unlike in Rhomphaiodon, Safrodus, Sphenodus, and some Synechodus species, where RBE is absent).
Original diagnosis after Saugen, Roberts, Engelschion & Hurum, 2024 [34071]: Eorapax serrasis, based on isolated teeth, possess the following unique character combinations: Monocuspid (unlike Synechodontiformes and Hexanchiformes (except Sphenodus) that are multicuspids); minute vertical crests at the base of the crown and a strong transverse crest on the lingual face; lingually inclined cusp (differs from the sigmoidal cusp in Sphenodus); serrated cutting edge (different from the sharp cutting edge in Synechodus, Safrodus, Grozonodon, and Mucrovenator, and blunt in Wimanodon and Rhomphaiodon); anaulacorhizy to pseudopolyaulacorhizy root vascularization pattern (compared with anaulacorhizy in Grozonodon and Sphenodus, pseudopolyaulacorhizy in Synechodontiformes and Hexanchiformes); pseudoosteodont; enameloid includes SCE, PBE, TBE, and RBE (unlike in Rhomphaiodon, Safrodus, Sphenodus, and some Synechodus species, where RBE is absent).
Remarks
shark-references Species-ID=17555
shark-references Species-ID=17555
References
A new assemblage of Lower Triassic neoselachians (Chondrichthyes) from the Grippia Bonebed of Spitsbergen, Norway. Journal of Vertebrate Paleontology, 44(3), Article e2426544
DOI: 10.1080/02724634.2024.2426544
A new assemblage of Lower Triassic neoselachians (Chondrichthyes) from the Grippia Bonebed of Spitsbergen, Norway. Journal of Vertebrate Paleontology, 44(3), Article e2426544
DOI: 10.1080/02724634.2024.2426544
