parallelus, Simpsonichthys Costa [W. J. E. M.] 2000:13, Figs. 7-8 [Aquarium (Brasil) v. 3 (no. 25); ref. 25933] Alagado sazonal na várzea do rio Formoso, um tributário do rio Correntes, Estado de Goiás, Brazil. Holotype: MZUSP 57357. Paratypes: MCP 22681 (4); MZUSP 57538 (4); UFRJ 4838-39 (7, 4), 5196-97 (16, 4). •Valid as Simpsonichthys parallelus Costa 2000 -- (Costa et al. 2003:140 [ref. 26946], Costa in Reis et al. 2003:542 [ref. 27061], Costa 2006:17 [ref. 28620], Costa & Brasil 2006:221 [ref. 28843], Costa 2007:200 [ref. 29338], Costa 2007:29 [ref. 29445], Costa 2012:314 [ref. 31750], Nielsen et al. 2017:166 [ref. 35304]). Current status: Valid as Simpsonichthys parallelus Costa 2000. Rivulidae: Cynolebiinae. Distribution: Formoso River, Goiás, rio Paranaíba drainage, central Brazil. Habitat: freshwater.