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Acanthodii underklasse

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DK 544
Statens Naturhistorisk Museum
Peter Mortensen
Bestemt af:
Tarup-Davinde, Fyn


Foto ©: Sten Lennart Jakobsen


Foto ©: Sten Lennart Jakobsen

 Beskrivelse:   af  Gilles Cuny 
The blocks contain at least 4 heterostracans fragments, one spine and three teeth of Ischnacanthid-like acanthodian and one Lophosteus spine.
The latter, as noted by Henning Blom, is the most interesting fossils, as stem osteichthyan remains badly known in the Silurian. Although remains of Lophosteus are well documented from Estonia and erratic blocks from Germany, this is the first record of this stem osteichthyan in Denmark, and it will thus represent an important addition to the Danish collection of vertebrate fossils. I therefore strongly suggest that this fossil, as well as it accompanying fauna, are declared Danekræ.

Kommentar af Henning Blom
The material you show is very interesting and indeed it is of Silurian age, unless reworked etc.

The tooth whorl is an acanthodian one, Ischnacanthid- like although the Silurian ones are slightly problematic.

The "scales" is a bit of an heterostracan. Possibly both a bit of the head shield and the anterior part of body with scale. Difficult to call the taxon but it is similar to the Silurian Archeogonaspis, which we have in both Estonia and Gotland.

The third fragment is very interesting since it is part of a Lophosteus spine. In other word a stem osteichthyan (non acanthodian). See Botella at al. 2007 in Nature. My student Anna Jerve will actaually work on this kind of material and we have just been to Saaremaa (Estonia) and collected several hundred of kilos for dissolving to find Lophosteus. We also have a project describing other bits than spines. The age should be Pridoli as that is the age of the Estonian form, which are virtually identical with the one you have.

I assume this is an erratic boulder? It is an interesting find indeed, but I guess it will be difficult to find more.

 Note Fisk - acanthode

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