Trilobite Fossils from Russia

ÃËÑÊÊÔ¹¤éÒ: 000127

ÃÒÂÅÐàÍÕ´: Russian trilobite

Asaphus raniceps (Russian Trilobites)
Geological Time : Lower Ordovician Kunda Horizon

Size: inches (25.4mm=1 inch): 48 mm long by 28 mm wide on a 95 by 80 mm matrix

Fossil Site : Kunda Level deposits of the Wolchow River region near Saint Petersburg, Russia

Description :
A fine, well-inflated example of an ancient member of the Asaphidae, this is Asaphus raniceps. The region in which these trilobites lived was subject to dramatic changes in salinity and turbidity, and the trilobites were able to make rapid (geologically speaking) evolutionary adjustments. These adjustments were thought to be able to allow them to see both predator and prey more easily. This taxon was a stem trilobite that ultimately led to Asapahus ornatus, the last survivor of the genus. This one is presented in a relaxed pose exposing the dorsal surface rather artistically.

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