Asaphus lepidurus Russian trilobite

Coming from the Lower Ordovician Wolchov Horizan deposits near Saint Petersburg, Russia, this is a trilobite known as Asaphus lepidurus, one of the oldest of the Asaphids, stretching back nearly a half billion years in time. Asaphus lepidurus is believed to be a the progenitor of two major lines of Asaphus that followed.

Also see: Russian Trilobites Gallery Russian Asaphidae Evolution Sequence