Asaphus lepidurus
Russian trilobite

Coming from the Lower Ordovician Volhovian Level 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. The trilobite is presented as if crawling acoss its 1.5 inch high matrix base. At 2.6 inches long (measured along the curve) and 1.4 inches wide at the genal spines, it is a good example of its taxon. Lepidurus is belived to be a the progenitor of two major lines of Asaphus that followed