quadruncus, Gambusia Langerhans [R. B.] in Langerhans, Gifford, Domínguez-Domínguez, Garcí-B. & Dewitt 2012:1520, Figs. 2-3 [Journal of Fish Biology v. 81 (issue 5); ref. 32308] Río Guayalejo, El Limón, Tamailipas, 19 km south of Xicoténcati, 22°49'53"N, 99°00'39"W, México. Holotype: UMMZ 248855. Paratypes: TNHC45833 (1), 45834 (22), 457835 (5), 248857 (26), 248858 (2). •Valid as Gambusia quadruncus Langerhans 2012 -- (Meyer 2015:96 [ref. 34698], Huber 2019:71 [ref. 36941] as quadrunca, Page et al. 2023:146 [ref. 40505]). Current status: Valid as Gambusia quadruncus Langerhans 2012. Poeciliidae: Poeciliinae. Distribution: Southern North America: Atlantic slope (central Mexico). Habitat: freshwater.