aporus, Megupsilon Miller [R. R.] & Walters [V.] 1972:5, Fig. 3 [Contributions in Science (Los Angeles) No. 233; ref. 3020] El Potosí, Nuevo León, Mexico. Holotype: UMMZ 189018. Paratypes: AMNH 38405 (10, 2 c&s); LACM 32147-1 (25), UCLA W68-21 (124), UMMZ 189017 (1), 189019 (1, allotype), 189020 (510, now 500, 2 c&s). Extinct in the wild -- (Lazara 2001:205 [ref. 25711]). •Valid as Megupsilon aporus Miller & Walters 1972 -- (Parenti 1981:530 [ref. 7066], Espinosa Pérez et al. 1993:37 [ref. 22290], Contreras-Balderas & Lozano-Vilano 1996:34 [ref. 22301], Lazara 2001:205 [ref. 25711], Nelson et al. 2004:109 [ref. 27807], Miller 2006:317 [ref. 28615], Scharpf 2007:34 [ref. 30398], Page et al. 2013:108 [ref. 32708], Lozano-Vilano & De la Maza-Benignos 2016:30 [ref. 35401], Esmaeili et al. 2018:17 [ref. 36738], Page et al. 2023:143 [ref. 40505]). Current status: Valid as Megupsilon aporus Miller & Walters 1972. Cyprinodontidae: Cyprinodontinae. Distribution: Southern North America: springs and outflows at El Potosí, Nuevo León (Mexico). Habitat: freshwater.