Genus Nymphaster Sladen, 1889

Type species. Nymphaster arenatus (Perrier, 1881) (type by subsequent designation by Fisher, 1917).

Remarks. The genus Nymphaster includes 16 species and only N. arenatus occurs in the Atlantic Ocean (Mah, 2020b). Halpern (1970b) identified two species from the Atlantic Ocean, but Clark & Downey (1992) synonymized N. subspinosus (Perrier, 1881) with N. arenatus .