parvellus, Hyphessobrycon Ellis [M. D.] 1911:153, Pl. 2 (fig. 1) [Annals of the Carnegie Museum v. 8 (no. 1, art. 2); ref. 1269] Rio Catú at Alagoinhas, Brazil. Holotype: FMNH 54392 [ex CM 3011]. Paratypes: (14) FMNH 54298-99 (1, 7), 54393-95 (3, 1, 1). Type catalog: Henn 1928:66 [ref. 12305], Ibarra & Stewart 1987:48 [ref. 12367]. •Valid as Hyphessobrycon parvellus Ellis 1911 -- (Lima & Gerhard 2001:110 [ref. 25355], Lima & Costa 2001:233 [ref. 25700], Lima & Malabarba in Reis et al. 2003:139 [ref. 27061], Zanata & Camelier 2010:776 [ref. 31077], Dagosta et al. 2014:366 [ref. 33382], Petry et al. 2016:302 [ref. 34966] as aff. parvellus, Zanata et al. 2018:[11] [ref. 35863], Faria et al. 2018:8 [ref. 35883], Silva et al. 2020:6 [ref. 37809], Lima et al. 2024:197 [ref. 40817], Vieira-Guimarães et al. 2024:39 [ref. 41258]). Current status: Valid as Hyphessobrycon parvellus Ellis 1911. Acestrorhamphidae: Hyphessobryconinae. Distribution: South America: Catu and Itapicuru rivers (northeastern Brazil). Habitat: freshwater.