[The Ordovician of the Siberian Platform. A palaeontological atlas. Phylum Arthropoda. Arthropods. Class Trilobita. Trilobites. The Lower Ordovician trilobites of the Siberian Platform.] Rossiiskaya Akademiya Nauk Sibirskoe Otdelenie Trudy Instituta Geologii i Geofiziki, 590 1984: 57-72. 72 [Zoological Record Volume 121]