usumacintae, Potamarius Betancur-R. [R.] & Willink [P. W.] 2007:820, Fig. 2 (A-C), 3, 5A [Copeia 2007 (no. 4); ref. 29439] Petén, Río San Pedro at junction with spring-fed lagoon at El Paso de Caballo, Río Usumacinta basin, Guatemala. Holotype: UMMZ 248165. Paratypes: many at AMNH, AUM, ECO-SC, FMNH, UMMZ. •Valid as Potamarius usumacintae Betancur-R. & Willink 2007 -- (Page et al. 2013:82 [ref. 32708], Barrientos et al. 2023:272 [ref. 41235], Marceniuk et al. 2023:20 [ref. 40422], Page et al. 2023:78 [ref. 40505], Quintana 2024:5 [ref. 41186]). Current status: Valid as Potamarius usumacintae Betancur-R. & Willink 2007. Ariidae: Ariinae. Distribution: Southern North America, Central America: Río Usumacinta basin (Guatemala and Mexico). Habitat: freshwater.