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 Faktiske data om fund 
Katalognummer:
484
Accessionsnummer:
DK 541
Samling:
Danekræsamlingen
Samler:
Statens Naturhistorisk Museum
Finder:
Dennis L. Rasmussen
Bestemt af:
Gilles Cuny
Lokalitet:
Trelde Næs, Fredericia
Stratigrafi:
Lillebælt Ler Formation
Periode:
Nederste Eocæn (Ypresien)
Type:
Sediment:
Plastisk ler

Billede

Foto ©: Sten Lennart Jakobsen


Billede

Foto ©: Sten Lennart Jakobsen


 Beskrivelse:   af  Gilles Cuny 
The find consists of 82 vertebrae and three teeth found in the Lillebælt Ler Formation (Lower Eocene) at Trelde Næs on a surface not exceeding 2 X 1.5 m according to the pictures sent by the founder, Mr. Dennis Løndal Rasmussen.

One of the teeth is very similar to those of Odontaspis winkleri, a common European species from the Eocene. The vertebrae are of a lamnoid type, showing numerous radial septa in addition to a pair of basiventral and basidorsal foramina. Such a vertebral morphology fits well the genus Odontaspis, and it is therefore likely that all the material belong to the same species, and probably to a single individual. However, an identification at species level will need the material to be further prepared, and is impossible for the time being.

The arrangement of the vertebrae, some small ones being found in direct contact with larger ones, indicates that the specimen was transported and the vertebrae somewhat mixed together. A typical Odontaspis specimen possesses around 180 vertebrae, so DK 541 does not represent a complete specimen. The percentage of small vertebrae and the rarity of teeth suggest that DK 541 corresponds to the caudal part of the animal. It might also be possible that at least some of the teeth associated with the vertebrae might belong to a scavenger, whether from the same or a different species. Again, only further preparation of the material will allow a precise understanding of this fossil.

Nevertheless, this find represents the most complete shark ever found in Denmark (at least 46% of the vertebrae of a complete animal) and might represent the first fossil vertebrae that could be assigned with any confidence to a particular species of Odontaspis. I therefore consider this fossil well worth being declared Danekræ.

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