Marjumia bagginsi
May. 25th, 2014 11:12 pmMelzak A., Westrop S.R. 1994. Mid-Cambrian (Marjuman) trilobites from the Pika Formation, southern Canadian Rocky Mountains, Alberta // Canadian Journal of Earth Sciences. 31(6): 969-985. (Описание: с. 976.)
Картинка:

Картинка из первоисточника.