polyancistrus, Xenurobrycon Weitzman [S. H.] 1987:113, Figs. 1-3 [Proceedings of the Biological Society of Washington v. 100 (no. 1); ref. 5982] Río Isiboro, Laguna Motacusal, Estado Beni, Bolivia, 15°40'S, 65°00'W. Holotype: MNHN 1986-0452. Paratypes: MNHN 1986-0453 (6); USNM 278188 (2, 1 c&s), 278190-91 (4, 5). Type catalog: Vari & Howe 1991:41 [ref. 19022]. •Valid as Xenurobrycon polyancistrus Weitzman 1987 -- (Géry & Römer 1997:70 [ref. 23712], Weitzman & Burns 1997:137 [ref. 24512], Weitzman in Reis et al. 2003:228 [ref. 27061], Moreira 2005:855 [ref. 28474], Sarmiento et al. 2014:185 [ref. 35004], Thomaz et al. 2015:Add. 5 [ref. 33893], Mendonça et al. 2016:[7] [ref. 34350], Menezes & Camelier 2024:286 [ref. 40817]). Current status: Valid as Xenurobrycon polyancistrus Weitzman 1987. Characidae: Stevardiinae. Distribution: South America: Mamoré and Madre de Dios River basins, western Amazon basin, Bolivia and Peru. Habitat: freshwater.