Lampanyctus steinbecki Bolin, 1939 .

Longfin Lampfish. To 12.4 cm (4.9 in) SL (Personal communication: Scripps Institution of Oceanography Fish Collection, La Jolla, California). Indo-Pacific; western Pacific Ocean to northern Japan (Balanov et al. 2009); northern California (Berry and Perkins 1966) to Chile (Wisner 1976). Depth: 70–1,830 m (230–6,002 ft) (min.: Clarke 1980; max.: Personal communication: Los Angeles County Museum of Natural History Fish Collection, Los Angeles, California). Butler et al. (1997) note that this species is closely related to and may be confused with L. tenuiformis and L. festivus, and that the taxonomy of this species is not fully resolved.