[New middle Palaeozoic trilobites of Central Kazakhstan, Rudny Altai and the Arctic,]. New species of prehistoric plants and invertebrates of the USSR Part 2., B. P. Markovsky [ed.], ] VSEGEI, Moscow 1960: 256-280 liv-lvi text-figs. 41-42 [Russian]., 1961: 256-280. Chapter pagination: 256-280. [Zoological Record Volume 98]