segrex, Etheostoma Norris [S. M.] & Minckley [W. L.] 1997:170, Fig. 9 [Ichthyological Exploration of Freshwaters v. 8 (no. 2); ref. 23278] Río Salado de los Nadadores at El Cariño de la Montaña, 27°00'N, 101°48'W, Coahuila, Mexico. Holotype: UMMZ 233090. Paratypes: ASU 918 (44, 3 c&s), 1728 (3), 5985 (11, 2 c&s); IBUNAM-P 8811 (15); TU 84762 (4), 87573 (35); UANL 2961 (5), 7315 (1); UMMZ 179174 (8), 179815 (1), 179824 (42). Type catalog: Contreras-Balderas et al. 1998:6 [ref. 23752]. •Valid as Etheostoma segrex Norris & Minckley 1997 -- (Nelson et al. 2004:135 [ref. 27807], Miller 2006:337 [ref. 28615], Scharpf 2008:31 [ref. 30399], Page et al. 2013:139 [ref. 32708], Page et al. 2023:201 [ref. 40505]). Current status: Valid as Etheostoma segrex Norris & Minckley 1997. Percidae: Etheostomatinae. Distribution: Southern North America: Nadadores River drainage, Coahuila, Atlantic Slope (Mexico); possibly extinct. Habitat: freshwater.