Cetorhinus huddlestoni

Welton, 2014


Classification: Elasmobranchii Lamniformes Cetorhinidae

Reference of the original description
Welton, B.J. (2014)
A new fossil basking shark (Lamniformes: Cetorhinidae) from the Middle Miocene Sharktooth Hill Bonebed, Kern County, California. Contributions in Science, Los Angeles County Museum, 522, 29–44


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Citation: Cetorhinus huddlestoni Welton, 2014: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 04/2025

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Cetorhinus huddlestoni Welton, 2014; Sharktooth Hill Bone Bed, Round Mountain Silt, Temblor Formation, early Middle Miocene; Sharktooth Hill, Bakersfield, Kern County, California, USA; coll. J. Pollerspöck, Stephansposching, © T. Reinecke, Bochum

Description
Original diagnose after Welton (2014) p. 32 [20629]: A species of Cetorhinus that differs from C. maximus in having the following characters in combination: adult teeth with robust crowns, generally equal, slightly higher, or slightly lower than root height in lingual view; in mesial view, cusp apex equals or only slightly extends lingually beyond the root protuberance; mesial and distal crown margins nearly parallel, straight to convex, or slightly converging for onehalf to two-thirds crown height; distal third of cusp tapers rapidly to a sharp apex; apex of cusp often with pronounced distal flexure; mesial cutting ridge generally extends from cusp apex basally for a distance of two-thirds or more of the crown height, and sometimes reaches the crown foot; cusplets generally absent, or sometimes developed above mesial crown foot as a short, labiolingually compressed blade with an apical cutting ridge that may or may not be continuous with the main mesial cutting ridge; labial crown face with highly variable, sparse to numerous, short, subparallel ridges on the upper half of the crown; enameloid folds at the labial crown foot never developed; lingual neck very narrow; in labial view, mesial and distal tooth margins not constricted at crown foot; in mesial view, root weakly convex lingually, angular to subangular basally, and subangular to weakly convex labially; basal margin of root in lingual view usually strongly concave with short, robust, well-developed mesial and distal root lobes; lingual protuberance weakly convex and positioned high on root; a single central lingual foramen present on the lingual protuberance of many teeth; juvenile teeth with narrower, taller, more attenuated crowns; crown height in lingual view greater than root height; in mesial view, cusp apex never extends lingually beyond the root protuberance; mesial and distal crown margins nearly parallel, straight to convex, or slightly converging in lower half to one-fourth of crown; distal two-thirds to half of crown tapers to a sharp apex; cusp of some teeth are moderately twisted (axial twist) in a labial-distal direction; mesial cutting ridge generally extends from cusp apex basally for a distance of one-fourth to two-thirds cusp height, and sometimes reaches the crown foot; single mesial cusplet sometimes occurs on teeth near the distal end of the dental series in both jaws; cusplet bladelike, positioned low on crown, labiolingually compressed, and an uninterrupted mesial cutting ridge may extend across its apex; labial crown face smooth, or with sparse to numerous, short, subparallel ridges, generally on the upper half of the crown; enameloid folds at the labial crown foot never developed; lingual neck very narrow; in labial view, mesial and distal tooth margins not constricted at crown foot; in mesial view, root weakly convex lingually, angular to subangular basally, and subangular to weakly convex labially; basal margin of root in lingual view usually weakly concave to nearly flat; most teeth with weakly developed, short, mesial and distal root lobes; lingual protuberance weakly convex and positioned high on root; a single central lingual foramen is present on the lingual protuberance of some teeth.

Remarks
shark-references Species-ID=14014;


References
Malyshkina, T.P. & Ward, D.J. & Nazarkin, M.V. & Nam, G.-S. & Kwon, S.-H. & Lee, J.-H. & Kim, T.-W. & Kim, D.-K. & Baek, D.-S. (2023)
Miocene Elasmobranchii from the Duho Formation, South Korea. Historical Biology, 35(9), 1726–1741
DOI: 10.1080/08912963.2022.2110870
Malyshkina, T.P. & Nam, G.-S. & Kwon, S.H. (2022)
Basking shark remains (Lamniformes, Cetorhinidae) from the Miocene of South Korea. Journal of Vertebrate Paleontology, 41(5), Article e2037625
DOI: 10.1080/02724634.2021.2037625
Condamine, F.L. & Romieu, J. & Guinot, G. (2019)
Climate cooling and clade competition likely drove the decline of lamniform sharks. Proceedings of the National Academy of Sciences of the United States of America, 116(41), 20584–20590
DOI: 10.1073/pnas.1902693116
Welton, B.J. (2014)
A new fossil basking shark (Lamniformes: Cetorhinidae) from the Middle Miocene Sharktooth Hill Bonebed, Kern County, California. Contributions in Science, Los Angeles County Museum, 522, 29–44