Moskvin, M. M. & Shimanskaya, N. V. 1993. [Genus Echinocorys (Echinoidea) in the Danian of eastern part of the European paleobiogeographic province. Part 2]. Byulleten' Moskovskogo Obshchestva Ispytatelei Prirody. Otdel Geologicheskii 68, 44-59. page(s): 54; figs. 5: 2a-в [details]
original descriptionMoskvin, M. M. & Shimanskaya, N. V. 1993. [Genus Echinocorys (Echinoidea) in the Danian of eastern part of the European paleobiogeographic province. Part 2]. Byulleten' Moskovskogo Obshchestva Ispytatelei Prirody. Otdel Geologicheskii 68, 44-59. page(s): 54; figs. 5: 2a-в [details]