Genus Ophiactis Lütken, 1856

The genus includes 51 recognized species. Clark and Rowe (1971) report 18 species from the shallow IWP, but currently only 11 of these are recognized (Stöhr et al. 2016). They can be divided into two groups: (i) species with two distal oral papillae on each side of a jaw and six or more arm spines (4 species), and (ii) species with a single distal oral papilla and up to five arm spines per side (7 species) .