obliqua, Heterandria Rosen [D. E.] 1979:321, Figs. 5, 6, 10, 16, 21, 24, 26 [Bulletin of the American Museum of Natural History v. 162 (art. 5); ref. 22796] Upper Río San Ramón basin, Río Usumacinta system, Huehuetenango, Guatemala. Holotype: AMNH 36311. Paratypes: AMNH 24638 (11), 32909 (124), 32915 (10), 36313-18 (21, 43, 113, 17, 7, 13); UMMZ 188010 (1), 190507 (1), 190768 (7), 193893 (97), 193911 (39), 193935 (18), 197073 (11), 197079 (138). •Valid as Heterandria obliqua Rosen 1979 -- (Lucinda in Reis et al. 2003:562 [ref. 27061], Lucinda & Reis 2005:40 [ref. 29205], McEachran & DeWitt 2008:52 [ref. 29720]). •Valid as Pseudoxiphophorus obliquus (Rosen 1979) -- (Radda 1985:128 [ref. 31261], Morales-Cazan & Albert 2012:22 [ref. 31911], Meyer 2015:347 [ref. 34698], Huber 2019:138 [ref. 36941], Barrientos et al. 2023:274 [ref. 41235]). Current status: Valid as Pseudoxiphophorus obliquus (Rosen 1979). Poeciliidae: Poeciliinae. Distribution: Central America: western-central Guatemala endemic. Habitat: freshwater.