Dykeius garethi

Cappetta, Morrison & Adnet, 2019


Classification: Elasmobranchii Hexanchiformes Chlamydoselachidae

Reference of the original description
Cappetta, H. & Morrison, K. & Adnet, S. (2021)
A shark fauna from the Campanian of Hornby Island, British Columbia, Canada: an insight into the diversity of Cretaceous deep-water assemblages. Historical Biology, 33(8), 1121–1182

Types
Dykeius garethi



Description:


Citation: Dykeius garethi Cappetta, Morrison & Adnet, 2019: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 10/2024

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Dykeius garethi Cappetta, Morrison & Adnet, 2019, Late Cretaceous, Late Campanian, Northumberland Formation, Nanalmo Group, Collishaw Point, Hornby Island, Canada. Collection and © Adam Anderson

Description
Original diagnosis after Cappetta, Morrison & Adnet, 2019 [27810]: This monospecific chlamydoselachid genus is characterised by the following combination of dental characters: a particularly large size compared to other representatives of the family, extinct as well as extant. Indeed, the largest tooth is 28.5 mm in total height. The cusps are high, erect and slender, clearly sigmoid, almost perpendicular to the root basal face, and with enameloid completely devoid of folds. Absence of intermediate or marginal cusplets. Occurrence of a pair of very strong, high and labio-lingually oriented lingual crests on the lingual face of the root. The root is much more developed transversely than labio-lingually.

Remarks
shark-references Species-ID=15531;
valid after Cappetta, Morrison & Adnet, 2021 [27810]

References
Guinot, G. & Condamine, F.L. (2023)
Global impact and selectivity of the Cretaceous-Paleogene mass extinction among sharks, skates, and rays. Science, 379, 802–806
DOI: 10.1126/science.abn2080
Cappetta, H. & Morrison, K. & Adnet, S. (2021)
A shark fauna from the Campanian of Hornby Island, British Columbia, Canada: an insight into the diversity of Cretaceous deep-water assemblages. Historical Biology, 33(8), 1121–1182
DOI: 10.1080/08912963.2019.1681421