Medialuna californiensis (Steindachner, 1875) .

Halfmoon. To 48.3 cm (19 in) TL (Miller and Lea 1972). Vancouver Island, British Columbia (Nagtegaal and Farlinger 1981) to south-western corner of Gulf of California (Robertson and Allen 2002). Depth: surface (Personal communication: Scripps Institution of Oceanography Fish Collection, La Jolla, California), intertidal to 44 m (144 ft) (min.: Allen 1999; max.: M.L., unpubl. data). Date sometimes seen as 1876 (Fricke et al. 2020).