Hygophum atratum (Garman, 1899) .

Thickhead Flashlightfish. To 6 cm (2.4 in) SL (Wisner 1976). Southern California (Wisner 1976) to Chile (Personal communication: Scripps Institution of Oceanography Fish Collection, La Jolla, California). Depth: surface to at least 488 m (1,600 ft) (min.: Personal communication: Scripps Institution of Oceanography Fish Collection, La Jolla, California; max.: Personal communication: Scripps Institution of Oceanography Fish Collection, La Jolla, California), perhaps as deep as 4,268 m (13,999 ft) (Personal communication: Los Angeles County Museum of Natural History Fish Collection, Los Angeles, California). The latter record from a midwater trawl that may have taken the specimen above the deepest tow depth.