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Keasius parvus?

 Faktiske data om fund 
Katalognummer:
754
Accessionsnummer:
DK 768
Samling:
Danekræsamlingen
Samler:
Statens Naturhistorisk Museum
Finder:
Poul Søby Nielsen
Bestemt af:
Gilles Cuny
Lokalitet:
Lyby Strand, Salling
Stratigrafi:
Brejning Ler
Periode:
Sen Oligocæn
Type:
Konkretion
Sediment:

Billede

Foto ©: Sten Lennart Jakobsen


Billede

Foto ©: Sten Lennart Jakobsen


 Beskrivelse:   af  Gilles Cuny 
DK768 consists of six shark vertebral centra found at Lyby Strand in the Brejninge Clay (Oligocene) by Poul Søby. Although isolated shark vertebral centra are notoriously difficult to identify, this find is significant for two reasons:
  1. To the best of my knowledge, this kind of fossils is quite common in the Eocene and Miocene of Denmark, but this is the first find of vertebral centra in the Oligocene.
  2. The presence of many septae on the side of the centra clearly indicate that they could belong to a Lamniformes or an Orectolobiformes. However, fossil record of Orectolobiformes is almost unknown so that no meaningful comparisons could be done. Concerning the Lamniformes, the centra are unusually elongated cranio-caudally, which allow to eliminate a number of possibilities : Otodus, Carcharocles, Carcharias, Odontaspis and Isurus. The best match would be an anterior part of the vertebral column of Keasius parvus, a primitive basking shark. Such vertebrae have so far only been found in Belgium. Moreover, this discovery nicely complement the recent discovery of a gill raker of Keasius in the Late Oligocene of Denmark (DK 735) and this fossil is therefore very important to our understanding of the evolution of the basking shark lineage in northern part of Europe.
I therefore advise this fossil to be declared Danekræ, based on its scientific value and quality of the preparation work.

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