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Heptranchias cf. howelli

 Faktiske data om fund 
Katalognummer:
555
Accessionsnummer:
DK 616
Samling:
Danekræsamlingen
Samler:
Statens Naturhistorisk Museum
Finder:
Mikkel Rødvig
Bestemt af:
Gilles Cuny
Lokalitet:
Trelde Næs, Fredericia
Stratigrafi:
Lillebælt Ler Formationen
Periode:
Eocæn [Ypresien/Lutetien]
Type:
Sediment:

Billede

Foto ©: Sten Lennart Jakobsen

Labial.

Lingual.Billede

Foto ©: Sten Lennart Jakobsen


 Beskrivelse:   af  Gilles Cuny 
DK 616, measuring approximately 13 mm mesio-distally, is a left lower tooth of Heptranchias cf. howelli that was found in the Lillebælt Ler Formation (Ypresian to Lutetian in age) on the coast of Trelde Næs. Although the exact layer which yielded the tooth is not known as the tooth was found through bulk sampling, its age and geographic origin are quite well known.

The size of the accessory cusplets decreasing irregularly toward the distal end of the crown leaves no doubt that this tooth belongs to Heptranchias and its age (Early-Middle Eocene) suggests it probably belongs to the species H. howelli, although a single tooth is not enough to ascertain an identification at species level.

Heptranchias is first recorded in the Danian and has already been documented from Denmark: One upper tooth has been found in the Lillebælt Ler Formation and lower teeth have been found in Fakse, the Plastic Ler Formation as well as from the Lillebælt Clay Formation. However, none of the four above mentionned teeth are so exquisitely preserved as DK 616. Such a perfect preservation is extremely rare worldwide and justifies this specimen to be declared Danekræ. The owner of this tooth, Mikkel Rødvig, was already offered 2000 USD for this tooth.

Apart from its esthetic value, DK 616 will be very valuable for a revision of the species H. howelli, which remains a rather rare and not well known species.

 Note Bruskfisk - hajtand - Heptranchias cf. howelli

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