decoratus, Rivulus Costa [W. J. E. M.] 1989:530, Figs. 6-6a [Revista Brasileira de Zoologia v. 6 (no. 3); ref. 14319] Near Rio Icatu falls, Ibiraba, Bahia State, Brazil. Holotype: MZUSP 39982. Paratypes: MZUSP 39983 (4). Type catalog: Huber 1992 [ref. 20639]. •Valid as Rivulus decoratus Costa 1989 -- (Huber 1992:173 [ref. 20639], Costa 1995:221 [ref. 21883], Lazara 2001:273 [ref. 25711], Costa 2003:41 [ref. 26966], Costa in Reis et al. 2003:535 [ref. 27061], Costa 2003:2 [ref. 27635], Costa 2006:162 [ref. 28875] in subgenus Melanorivulus, Costa 2010:194.3 [ref. 31043], Valdesalici et al. 2011:106 [ref. 31381]). •Valid as Melanorivulus decoratus (Costa 1989) -- (Costa 2011:241 [ref. 31655], Costa 2012:58 [ref. 32069], Costa et al. 2015:32 [ref. 33784], Costa 2017:64 [ref. 35046], Deprá et al. 2017:113 [ref. 35503], Silva et al. 2020:14 [ref. 37809]). Current status: Valid as Melanorivulus decoratus (Costa 1989). Rivulidae: Rivulinae. Distribution: South America: São Francisco River basin (Bahia State, Brazil). Habitat: freshwater.