Apogon guadalupensis (Osburn & Nichols, 1916) .

Guadalupe Cardinalfish. To about 13 cm (5 in) TL (Miller and Lea 1972). Anacapa Island and Santa Barbara Island, southern California (Richards and Engle 2001) to tip of Baja California (Robertson and Allen 2002) and Islas Revillagigedo (Sandknop and Watson in Moser 1996). Depth: 10–30 m (33–98 ft) (Robertson and Allen 2002). Likely a synonym of Apogon atricaudus Jordan & McGregor, 1898 (Piñeros et al. 2019).