platensis, Astyanacinus Messner [E.] 1962:5 [Boletin de la Asociacion Latino Americana de Ictiologos y Herpetologos v. 2 (no. 1); ref. 23528] Laguna Tropa Vieja, Canelones, Rio La Plata basin, Uruguay. Holotype (unique): MHNM CI 762. Type catalog: Olazarri et al. 1970:3 [ref. 23527]; see also Malabarba et al. 2004:99 [ref. 27836], Loureiro et al. 2016:412 [ref. 35150]. •Valid as Astyanacinus platensis Messner 1962 -- (Bertaco et al. 2010:266 [ref. 30864], Nión et al. 2016:29 [ref. 35565]). •Placement in Oligosarcus is controversial -- (Riveiro & Menezes 2015:41 [ref. 33768]). •Valid as Oligosarcus platensis (Messner 1962) -- (Mirande et al. 2011:16 [ref. 31465], Litz & Koerber 2014:15 [ref. 33622], Almirón et al. 2015:589 [ref. 33673], Loureiro et al. 2023:69 [ref. 40506], Menezes & Camelier 2024:244 [ref. 40817]). Current status: Valid as Oligosarcus platensis (Messner 1962). Acestrorhamphidae: Acestrorhamphinae. Distribution: South America: La Plata River basin (Uruguay). Habitat: freshwater.