cyaneus, Cynolebias Amato [L. H.] 1987:2, Pls. 1-2 [Comunicaciones Zoologicas del Museo de Historia Natural de Montevideo v. 11 (no. 163); ref. 16152] Floodlands of Dom Marcos Creek, Municipio de Río Pardo, Río Grande do Sul, Brazil. Holotype: MCP 10441. Paratypes: MCP 10442-44 (1, 16, 20); MHNM 2468 (1), 2508-10 (4, 4, 1), 2593 (1), uncat. (1); MZUSP 36446-47 (1, 1). Type catalog: Loureiro et al. 2016:412 [ref. 35150]. •Valid as Cynolebias cyaneus Amato 1987 -- (Malabarba 1989:158 [ref. 14217], Costa 1999:301 [ref. 24229]). •Valid as Austrolebias cyaneus (Amato 1987) -- (Costa 1998:75 [ref. 23792], Lazara 2001:61 [ref. 25711], Costa & Cheffe 2001:180 [ref. 25851], Costa 2002:917 [ref. 26505], Costa in Reis et al. 2003:527 [ref. 27061], Costa 2006:78 [ref. 28708], Costa 2009:188 [ref. 30417], Bertaco et al. 2016:424 [ref. 34561], Volcan et al. 2017:150 [ref. 35644], Loureiro et al. 2018:11 [ref. 36240]). •Valid as Matilebias cyaneus (Amato 1987) -- (Alonso et al. 2023:9 [ref. 40292]). Current status: Valid as Matilebias cyaneus (Amato 1987). Rivulidae: Cynolebiinae. Distribution: South America: Jacuí River basin, Laguna dos Patos system, Río Grande do Sul, Brazil. Habitat: freshwater.