geiseri, Gambusia Hubbs [Clark L.] & Hubbs [C. L.] in Hubbs & Springer 1957:285, Figs. 2a-b, 4-5 [Texas Journal of Science v. 9 (no. 3); ref. 12145] San Marcos River just downstream from the Rio Vista Dam, San Marcos, Texas, U.S.A. Holotype: UMMZ 168974. Paratypes: (435) TNHC 5 (?), 19 (?), 60 (?), 2651 (?); UMMZ 72565 (11), 72570-71 (179, 128), 108090 (1), 111005 (12), 1220247 (130, 3 c&s), 166018 (33, 5 c&s), 166043 (51). Additional material: (3,627 specimens) TNHC (10 lots); UMMZ (5 lots). •Valid as Gambusia geiseri Hubbs & Hubbs 1957 -- (Rosen & Bailey 1963:104 [ref. 7067], Lee et al. 1980:541 [ref. 22416], Rauchenberger 1989:3 [ref. 15687], Page & Burr 1991:238 [ref. 18983], Fuller et al. 1999:306 [ref. 25838], Garrett & Edwards 2003:783 [ref. 27258], Nelson et al. 2004:103 [ref. 27807], Lucinda & Reis 2005:41 [ref. 29205], Scharpf 2007:17 [ref. 30398], Meyer et al. 2010:13 [ref. 30817], Page & Burr 2011:449 [ref. 31215], Page et al. 2013:109 [ref. 32708], Meyer 2015:69 [ref. 34698], Huber 2019:63 [ref. 36941]). Current status: Valid as Gambusia geiseri Hubbs & Hubbs 1957. Poeciliidae: Poeciliinae. Distribution: Texas, U.S.A. Habitat: freshwater.