* Axoclinus nigricaudus Allen & Robertson, 1991 .

Cortez Triplefin. To 4.8 cm (1.9 in) TL (Robertson and Allen 2008). Gulf of California to Cabo San Lucas, southern Baja California (Watson in Moser 1996). Benthic; depth: intertidal to 6 m (20 ft) (min.: Allen and Robertson 1994; max.: Personal communication: Scripps Institution of Oceanography Fish Collection, La Jolla, California). Classified by some authors in Enneanectes; see review of taxonomic status in Smith and Williams (2002).