janeiroensis, Rivulus Costa [W. J. E. M.] 1991:583, Fig. 1 [Revue Suisse de Zoologie v. 98 (no. 3); ref. 20033] Forest stream, near Silva Jardim, Rio São Joao basin, Rio de Janeiro state, Brazil. Holotype: MZUSP 41383. Paratypes: MHNG 2512.85 (2); MZUSP 41384 (6); UFRJ 129 (2), 130 (2, 1 c&s). Type catalog: Huber 1992 [ref. 20639]. •Status uncertain -- (Huber 1992:270 [ref. 20639]). •Valid as Rivulus janeiroensis Costa 1991 -- (Lazara 2001:278 [ref. 25711], Costa in Reis et al. 2003:537 [ref. 27061], Costa 2004:105 [ref. 27824], Costa 2006:139 [ref. 28875] in subgenus Cynodonichthys, Costa 2008:47 [ref. 29622] in subgenus Atlantirivulus, Costa 2008:135 [ref. 29871], Costa & Lanés 2009:94 [ref. 30256]). •Valid as Atlantirivulus janeiroensis (Costa 1991) -- (Costa 2011:244 [ref. 31655], Costa 2014:19 [ref. 33307]). Current status: Valid as Atlantirivulus janeiroensis (Costa 1991). Rivulidae: Rivulinae. Distribution: Atlantic coastal river basins, Brazil. Habitat: freshwater.