Keasius taylori

WELTON, 2013


Classification: Elasmobranchii Lamniformes Cetorhinidae

Reference of the original description
WELTON, B.J. (2013)
A New Archaic Basking Shark (Lamniformes: Cetorhinidae) from the Late Eocene of Western Oregon, U.S.A., and Description of the Dentition, Gill Rakers and Vertebrae of the Recent Basking Shark Cetorhinus maximus (Gunnerus). New Mexico Museum of Natural History and Science, Bulletin, 58: 48pp

Types
Keasius taylori
Holotype: NWM: 2100; Paratype: LACM: 154926;


Description:


Citation: Keasius taylori WELTON, 2013: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 06/2021

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Description
Original diagnose after Welton (2013) p. 22 [17769]: A species of Keasius that differs from K. parvus, new combination, by having small adult gill rakers; base mesodistally short, and apicobasally high; medial process very short, and wide; basal angle subangular to rounded; basal margin short; bight narrow and subangular; basal height very high; filament base wide and robust; weakly curved to almost straight; vertebral centra dorsoventrally elongated in axial view; dorsal margin of centra, between basidorsal and basiventral insertions, weakly concave; lateral intermedialia with six to eight generally unbranched, straight radial calcifications, and zero to two radii in dorsal and ventral intermediale; cusps broad based, somewhat robust, and apically blunt or rounded; single mesial cusplet present on shoulder of some upper and lower lateral teeth; cusps always have cutting edges; lingual basal ledge with short, weak, vertical enameloid ridges.

Remarks
type species of Keasius Welton, 2013 p. 22 [17769] by original designation (Art. 68.2 ICZN);

valid after Welton (2013) p. 22 [17769];


References
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
REINECKE, T. & VON DER HOCHT, F. & DUFRAING, L. (2015)
Fossil basking shark of the genus Keasius (Lamniforme, Cetorhindiae) from the boreal North Sea Basin and Upper Rhine Graben: evolution of dental characteristics from the Oligocene to late Middle Miocene and description of two new species. Palaeontos, 28: 60 text–pages (incl. 24 text–figs and 2 tables).
WELTON, B.J. (2013)
A New Archaic Basking Shark (Lamniformes: Cetorhinidae) from the Late Eocene of Western Oregon, U.S.A., and Description of the Dentition, Gill Rakers and Vertebrae of the Recent Basking Shark Cetorhinus maximus (Gunnerus). New Mexico Museum of Natural History and Science, Bulletin, 58: 48pp