Abushik 1969. [New Early Silurian Beyrichiacea in the Siberian platform.] New species of fossil plants and invertebrates in the USSR 2 Part 2., New species of fossil plants and invertebrates in the USSR 2 Part 2.] Ministerstvo Geologii SSSR, Moskva, 1968. [In Russian], 1969: 245-247. Chapter pagination: 245-247