Distinguished from Diplopodiinae and basal members of the family by the complete absence of trigeminate plating except immediately adjacent to the peristome.
Ali, M. S. M. 1990. Cenomanian echinoids from Ras al Khaimah, United Arab Emirates. Neues Jahrbuch fur Mineralogie, Geologie und Palaontologie, Abhandlungen, 179, 97-116.
Smith, A. B. & Wright, C. W. 1993. British Cretaceous Echinoids. Part 3. Monograph of the Palaeontographical Society.