Undichna

Undichna
Temporal range: Silurian – ?
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Genus: Undichna
Species

Undichna is a fish-fin, or fish-swimming fossil trail left as a fossil impression on a substrate, or the opposite impression on an overlying substrate; this type of fossil is an ichnofossil, in this case a specific ichnogenus, Undichna; the term "undichna" is composed of the words: 'und''ichna', for "wave-trace".

At present, the oldest known Undichna were made by Cephalaspids, that only had presumptive motion scenarios, due to the physiological form of the cephalaspids as predating the teleosts, (bony fishes). The trails are from the border of England and Wales, from 400 mya, in an ancient riverbed environment.

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This article is issued from Wikipedia - version of the Monday, March 16, 2015. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.