Poretskaya, E. S. 1974. [New echinoids from the Upper Oxfordian of the Kopetdag range and on the problem of classification and phylogeny of the disasterids]. Voprosy Stratigrafii 1, 85-91. page(s): 87; figs а-е, pl. 1: figs 1-4 [details]
original descriptionPoretskaya, E. S. 1974. [New echinoids from the Upper Oxfordian of the Kopetdag range and on the problem of classification and phylogeny of the disasterids]. Voprosy Stratigrafii 1, 85-91. page(s): 87; figs а-е, pl. 1: figs 1-4 [details]