Zhuravleva 1966. Sphinctozoa Ruzhentzev, V. E.; Sarycheva, T. G.[Eds]. [Development and succession of marine organisms on the boundary of the Palaeozoic and Mesozoic], [Development and succession of marine organisms on the boundary of the Palaeozoic and Mesozoic]. Trudy paleont. List. Akad. Nauk SSSR. 108 1965: 1-431, 58 pis., 59 figs., 16 tabs., 1966: pp. 147-149. Chapter pagination: pp. 147-149