signum, Xiphophorus helleri Rosen [D. E.] & Kallman [K. D.] 1969:5, Figs. 1A, 2A, 3, 4A, 5-7 [American Museum Novitates No. 2379; ref. 7841] Río Semococh, tributary of Río Chajmaic, 15 kilometers by road south of Sebol, Alta Verapaz, Guatemala. Holotype: AMNH 27675. Paratypes or additional material: AMNH 27671 (413, 2 c&s), 27677-78 (18, 551); UMMZ 187935 (205), 187941 (441), 187951 (305). •Valid as Xiphophorus signum Rosen & Kallman 1969 -- (Rosen 1979:364 [ref. 22796], Rodriguez 1997:674 [ref. 23266], Meyer & Schartl 2002:59 [ref. 26066], Lucinda in Reis et al. 2003:575 [ref. 27061], Meyer & Schartl 2003:61 [ref. 27477], Lucinda & Reis 2005:44 [ref. 29205], Meyer 2015:407 [ref. 34698], Huber 2019:152 [ref. 36941], Barrientos et al. 2023:274 [ref. 41235], Quintana 2024:8 [ref. 41186]). Current status: Valid as Xiphophorus signum Rosen & Kallman 1969. Poeciliidae: Poeciliinae. Distribution: Central America: Río de la Pasion basin, Alta Verapaz, Atlantic slope (Guatemala) endemic. Habitat: freshwater.