apiamici, Rivulus Costa [W. J. E. M.] 1989:527, Figs. 3-3a [Revista Brasileira de Zoologia v. 6 (no. 3); ref. 14319] Bataquaçu, close to the state border, Mato Grosso do Sul, Brazil. Holotype: MZUSP 39976. Paratypes: MZUSP 39977 (6), plus non-type material. •Doubtfully valid as Rivulus apiamici Costa 1989 -- (Huber 1992:99 [ref. 20639]). •Synonym of Rivulus pictus Costa 1989 -- (Costa 1995:212 [ref. 21883], Lazara 2001:283 [ref. 25711]). •Valid as Rivulus apiamici Costa 1989 -- (Costa in Reis et al. 2003:534 [ref. 27061], Costa 2005:71 [ref. 28192], Costa 2006:162 [ref. 28875] in subgenus Melanorivulus). •Valid as Melanorivulus apiamici (Costa 1989) -- (Costa 2011:241 [ref. 31655], Nielsen et al. 2016:84 [ref. 34407], Deprá et al. 2017:113 [ref. 35503], Volcan et al. 2018:275 [ref. 35895], Ywamoto et al. 2020:128 [ref. 37763]). Current status: Valid as Melanorivulus apiamici (Costa 1989). Rivulidae: Rivulinae. Distribution: Paraná river basin, Mato Grosso do Sul state, Brazil. Habitat: freshwater.