arcuatus, Cyprinodon Minckley [W. L.] & Miller [R. R.] in Minckley, Miller & Norris 2002:699, Fig. 5 [Copeia 2002 (no. 3); ref. 26222] Pond fed by Monkey Spring, tributary to Santa Cruz River, (Gila River basin), 12 kilometers north-northeast of Patagonia, Santa Cruz County, Arizona, U.S.A. Holotype: UMMZ 162700. Paratypes: AMNH 232395 [ex UMMZ 125050] (20); ASU 600 (96), 729 (82), 4672 (7); CAS 18561 (2), 214579 [ex UMMZ 125050] (20); UMMZ 125050 (223), 162701 (41); USNM 21315 (2), 44096 (1), 45441 (2), 130002 (54). •Valid as Cyprinodon arcuatus Minckley & Miller 2002 -- (Nelson et al. 2004:108 [ref. 27807], Miller 2006:296 [ref. 28615], Scharpf 2007:30 [ref. 30398], Minckley & Marsh 2009:236 [ref. 31114], Page & Burr 2011:458 [ref. 31215], Page et al. 2013:106 [ref. 32708], Esmaeili et al. 2018:10 [ref. 36738]). Current status: Valid as Cyprinodon arcuatus Minckley & Miller 2002. Cyprinodontidae: Cyprinodontinae. Distribution: Arizona (U.S.A.) and possibly northern Mexico [extinct in the wild]. Habitat: freshwater.