†Orbiculus Bagdasaryan 1980

Bagdasaryan 1980. [New Palaeozoic Sphaeromorphitae from the European part of the USSR.] Mesezhnikov, M.S.[Ed]. [New genera and species of fossil plants and invertebrates of the USSR.], Nedra, Leningrad, 1980: 114-117. Chapter pagination: 8-9