acuen, Hisonotus Silva [G. S. C.], Roxo [F. F.] & Oliveira [C.] 2014:107, Figs. 1, 3-6 [ZooKeys No. 442; ref. 33533] Mato Grosso State, Municipality of Querência, rio Xingu basin, 13°00'26"S, 52°11'27"W, Brazil. Holotype: MZUSP 115350. Paratypes: LBP, NUP. Type catalog: Oliveira et al. 2022:15 [ref. 39255]. •Valid as Hisonotus acuen Silva, Roxo & Oliveira 2014 -- (Roxo et al. 2015:137 [ref. 33763], Zawadzki et al. 2016:379 [ref. 34367], Roxo et al. 2016:235 [ref. 34426], Calegari et al. 2017:243 [ref. 35203], Roxo et al. 2017:351 [ref. 35310], Roxo et al. 2018:[11] [ref. 35900], Dias et al. 2018:583 [ref. 36235], Ribeiro-Silva et al. 2020:558 [ref. 37845]). •Valid as Rhinotocinclus acuen (Silva, Roxo & Oliveira 2014) -- (Reis & Lehmann A. 2022:83 [ref. 39390]). Current status: Valid as Rhinotocinclus acuen (Silva, Roxo & Oliveira 2014). Loricariidae: Hypoptopomatinae. Distribution: South America: upper Xingu River basin, Mato Grosso, Brazil. Habitat: freshwater.
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