Differs from Cystechi nus A. Agassiz in having unfused anterior genital plates with just three gonopores. Mooi & David (1996) provide a detailed analysis of this genus. The three species vary only in slight details of pedicellarial structure and may well prove conspecific.
Agassiz, A. 1879. Preliminary report on the Echini of the exploring expedition H.M.S. Challanger. Proceedings of the American Academy of Arts and Science 14, 182-261.
Mooi, R. & David, B. 1996. Phylogenetic analysis of extreme morphologies: deep-sea holasteroid echinoids. Journal of Natural History 30, 913-953.