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Statens Naturhistorisk Museum
Sten Lennart Jakobsen
DK 735 consists of a 53 mm long basal part of a gill-raker of a basking shark found in an erratic block at Esbjerg Havn. According to Peter Mortensen, the latter is Late Oligocene in age.
The first basking sharks appeared in the fossil record in the Middle Eocene, but the first record of a basking shark in Denmark is from the Upper Miocene Gram Formation with the recovery of
. The latter genus first appeared in the Early Miocene, whereas Eocene to Oligocene basking sharks had been attributed to the genus
(Welton 2013). As it seems that it is possible to differentiate the two genera based on their gill-rakers, DK 735 potentially could help to better understand the early history of basking sharks in Northen Europe. I therefore advise it is declared Danekræ.