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

M.V. Nazarkin

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.

Key words: Oligocene, Miocene, Sakhalin, fossil basking shark, Cetorhinidae

Zoosystematica Rossica, 2014, 23(2): 269-275 ▪ Published in print 25 December 2014

https://doi.org/10.31610/zsr/2014.23.2.269 ▪ Open full article

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