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 09/2026
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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.
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
