"Genus Leptopenus Moseley, 1881
Diagnosis. Solitary, discoidal, free. No wall, costae alternating in position with septa. Costae and septa united by simple synapticulae producing very porous, delicate corallum. Columella trabecular.
Type-species: Leptopenus discus Moseley, 1881, by subsequent designation [Wells, 1936]." Cairns 1982, p. 9.