Gill rakers of basking sharks (Lamniformes: Cetorhinidae) from the Tertiary of Sakhalin Island, Russia

Author:

Nazarkin M.V.1

Affiliation:

1. Zoological Institute, Russian Academy of Sciences, 1 Universitetskaya Emb., St Petersburg 199034, Russia

Abstract

Isolated gill rakers of basking sharks (Lamniformes: Cetorhinidae) were collected from the upper Oligocene Holmsk Formation and Middle-Upper Miocene Kurasi Formation of the Sakhalin Island. This is the second finding of fossil basking shark remains in Russia. Fossil gill rakers are similar to those in recent representatives of the genus Cetorhinus, but differ from the latter by wider and shorter medial processes and higher bases. These features are more typical for basking sharks in the fossil genus Keasius. Additional material is needed for the exact taxonomic identification of the Tertiary basking sharks from Sakhalin.

Publisher

Zoological Institute of the Russian Academy of Sciences

Subject

Animal Science and Zoology,Insect Science,Ecology, Evolution, Behavior and Systematics

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