Gras (1848) proposed this name for two genera, Disaster and Metaporinus, both of which have split apical discs. Lambert (1909, p. 15) restricted its usage to forms with ocular plates II and IV external to the genital plates and not in contact medially. This was also the interpretation employed by Wagner & Durham (1966). The only genus with this character is Disaster itself.
Gras, A. 1848. Description des oursins fossiles du departement de l'Isere. Paris, 98 pp.
Lambert, J. 1909. Sur un echinide nouveau du Massif du Pelvoux. Traveaux du Laboratoire geologique, Faculte des Sciences, Universite Grenoble, 9(1), 284-292.
Wagner, C. D. & Durham, J. W. 1966. Holasteroids. in R. C. Moore (ed.) Treatise on Invertebrate Paleontology Part U. Echinodermata 3. Geological Society of America and University of Kansas Press, Boulder.