Paraisurus amudarjensis

Mertiniene, Nessov & Nazarkin, 1994


Classification: Elasmobranchii Lamniformes Cretoxyrhinidae

Reference of the original description
Mertiniene, R.A. & Nessov, L.A. & Nazarkin, M.V. (1994)
Cretaceous sharks of the genus Paraisurus in Uzbekistan and Lithuania. Geologija, 17, 139–143

Types
Paraisurus amudarjensis
Holotype: CMGE: N 123/12178;


Description:


Citation: Paraisurus amudarjensis Mertiniene, Nessov & Nazarkin, 1994: In: Database of fossil elasmobranch teeth www.shark-references.com, World Wide Web electronic publication, Version 01/2023

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Description
Original diagnose after Mertiniene et al. (1994) p. 139 [1646]: The tooth-is small. The labial side ·of the crown is higher than its width by 2.2 times. The pit between the root branches in the labial face transits into the shallow furrow of the crown. The lingual protuberance of the root is wide (in lingual view). The branches of the root are high, well separated, orientated to the sides more than in other species of the genus and have nearly the same thickness in all their length; the ends of branches are obtuse.

Remarks
valid after Mertiniene et al. (1994) p. 139 [1646];


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
Nessov, L.A. (1997)
Cretaceous Non-marine Vertebrates of Northern Eurasia. Edited by L.B. Golovneva & A.O. Averianov. University of St. Petersburg, Instifute of Earth Crust. 218 pp.,60 plates. Price
Mertiniene, R.A. & Nessov, L.A. & Nazarkin, M.V. (1994)
Cretaceous sharks of the genus Paraisurus in Uzbekistan and Lithuania. Geologija, 17, 139–143