Cristomylus leptostemma
Wynd, Demar & Wilson, 2020
Classification: Elasmobranchii Rhinopristiformes Rhinobatidae
Reference of the original description
Euselachian diversity through the uppermost Cretaceous Hell Creek Formation of Garfield County, Montana, USA, with implications for the Cretaceous-Paleogene mass extinction in freshwater environments. Cretaceous Research, 113, Article 104483
Euselachian diversity through the uppermost Cretaceous Hell Creek Formation of Garfield County, Montana, USA, with implications for the Cretaceous-Paleogene mass extinction in freshwater environments. Cretaceous Research, 113, Article 104483
Description:
Citation: Cristomylus leptostemma Wynd, Demar & Wilson, 2020: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 08/2026
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Description
Original diagnosis after Wynd, Demar & Wilson, 2020 [28685]: Species of Cristomylus differing from all other species of the genus in possessing the following combination of character states: occlusal surface of crown with a more prominently raised transverse crest; transverse crest sometimes bordered by a moderately deep furrow; occasional presence of weak to moderately developed occlusal crenulations on both the lingual and labial sides of the transverse crest; when present, crenulations restricted to the occlusal surface of the crown; crown lateral faces outwardly rounded apicobasally, with absent or poorly developed flattened facets; crown angles rounded; root consistently thicker and up to twice as thick as the crown.
Original diagnosis after Wynd, Demar & Wilson, 2020 [28685]: Species of Cristomylus differing from all other species of the genus in possessing the following combination of character states: occlusal surface of crown with a more prominently raised transverse crest; transverse crest sometimes bordered by a moderately deep furrow; occasional presence of weak to moderately developed occlusal crenulations on both the lingual and labial sides of the transverse crest; when present, crenulations restricted to the occlusal surface of the crown; crown lateral faces outwardly rounded apicobasally, with absent or poorly developed flattened facets; crown angles rounded; root consistently thicker and up to twice as thick as the crown.
Remarks
shark-references Species-ID=15999;
shark-references Species-ID=15999;
References
Euselachian diversity through the uppermost Cretaceous Hell Creek Formation of Garfield County, Montana, USA, with implications for the Cretaceous-Paleogene mass extinction in freshwater environments. Cretaceous Research, 113, Article 104483
DOI: 10.1016/j.cretres.2020.104483
Euselachian diversity through the uppermost Cretaceous Hell Creek Formation of Garfield County, Montana, USA, with implications for the Cretaceous-Paleogene mass extinction in freshwater environments. Cretaceous Research, 113, Article 104483
DOI: 10.1016/j.cretres.2020.104483
