eremus, Cyprinodon macularius Miller [R. R.] & Fuiman [L. A.] 1987:596, Figs. 3-4 [Copeia 1987 (no. 3); ref. 9180] Spring-fed pond, Quitobaquito, Organ Pipe Cactus Natl. Monument, Pima County, Arizona, U.S.A., elevation 332 meters. Holotype: UMMZ 162661. Paratypes: AMNH 57133 (10); ANSP 158520 (10); FMNH 97069 (10); SIO 59-43 (27); UMMZ 162662 (386), 211156 (4); USNM 279473 (10). •Synonym of Cyprinodon macularius Baird & Girard 1853 but a valid subspecies as described -- (Douglas et al. 2001:141 [ref. 25435]). •Valid as Cyprinodon eremus Miller & Fuiman 1987 -- (Lazara 2001:84 [ref. 25711], Minckley et al. 2002:691 [ref. 26222], Nelson et al. 2004:108 [ref. 27807], Miller 2006:301 [ref. 28615], Scharpf 2007:31 [ref. 30398], Minckley & Marsh 2009:234 [ref. 31114], Page & Burr 2011:458 [ref. 31215], Page et al. 2013:107 [ref. 32708], Lozano-Vilano & De la Maza-Benignos 2016:19 [ref. 35401], Esmaeili et al. 2018:12 [ref. 36738], Page et al. 2023:142 [ref. 40505]). Current status: Valid as Cyprinodon eremus Miller & Fuiman 1987. Cyprinodontidae: Cyprinodontinae. Distribution: Southern North America: border area between Arizona (U.S.A.) and northern Mexico. Habitat: freshwater.