nudiventris, Rivulus Costa [W. J. E. M.] & Brasil [G. C.] 1991:380, Figs. 3-4 [Ichthyological Exploration of Freshwaters v. 1 (no. 4); ref. 13612] Swamp on right bank of Rio Itapemirim, about 2 kilometers from the sea, County of Itapemirim, Espírito Santo, Brazil. Holotype: MZUSP 40283. Paratypes: MNRJ 11740 (2, c&s), MZUSP 40284 (3). •Status uncertain -- (Huber 1992:333 [ref. 20639]). •Valid as Rivulus nudiventris Costa & Brasil 1991 -- (Costa 1991:582 [ref. 20033], Lazara 2001:282 [ref. 25711], Costa in Reis et al. 2003:538 [ref. 27061], Costa 2004:105 [ref. 27824], Costa 2006:139 [ref. 28875] in subgenus Cynodonichthys, Costa 2007:128 [ref. 29225], Costa 2008:47 [ref. 29622] in subgenus Atlantirivulus, Costa 2008:135 [ref. 29871], Costa & Lanés 2009:94 [ref. 30256]). •Valid as Atlantirivulus nudiventris (Casta & Brasil 1991) -- (Costa 2011:244 [ref. 31655], Costa 2014:19 [ref. 33307], Vieira-Guimarães et al. 2024:54 [ref. 41258]). Current status: Valid as Atlantirivulus nudiventris (Costa & Brasil 1991). Rivulidae: Rivulinae. Distribution: South America: Itapemerim River floodplains (Brazil). Habitat: freshwater.