Description
Original diagnosis 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