gracilis, Kryptolebias Costa [W. J. E. M.] 2007:8, Figs. 1-2 [aqua, International Journal of Ichthyology v. 13 (no. 1); ref. 29397] Small black water creek adjacent to Rio Meto Grosso, Lagoa de Saquarema basin, Rio de Janeiro State, Brazil, approximately 22°53'S, 42036'W. Holotype: UFRJ 6450. Paratypes: (29) MCP 42222 (2); UFRJ 1689 (6), 6297 (9), 6345 (1 + 1 c&s), 6451 (10). •Valid as Kryptolebias gracilis Costa 2007. Current status: Valid as Kryptolebias gracilis Costa 2007. Rivulidae: Kryptolebiatinae. Distribution: Southeastern Brazil. Habitat: freshwater.