Very close to Pseudholaster, differing only in having hydropores extending over the anterior three ocular plates and genital plates 2 and 3. It differs from Hemipneustes and Opisopneustes in having the two columns of pore-pairs in its petals subequally developed. It differs from Pseudananchys (Zumoffenia) in having a shallow but well defined frontal sulcus.
Smith, A. B. & Wright, C. W. 2003. British Cretaceous echinoids. Part 7, Atelostomata, 1. Holasteroida. Palaeontographical Society Monographs, London. Pp. 440-568, pls 139-182.