Prorivulus Costa.

Loureiro, Marcelo, Sá, Rafael de, Serra, Sebastián W., Alonso, Felipe, Lanés, Luis Esteban Krause, Volcan, Matheus Vieira, Calviño, Pablo, Nielsen, Dalton, Duarte, Alejandro & Garcia, Graciela, 2018, Review of the family Rivulidae (Cyprinodontiformes, Aplocheiloidei) and a molecular and morphological phylogeny of the annual fish genus Austrolebias Costa 1998, Neotropical Ichthyology 16 (3), pp. 1-20 : 6

Prorivulus Costa. A monotypic non-annual genus, P. auriferus Costa, Lima & Suzart , from the coastal drainages of northeastern Brazil, is diagnosed by the presence of soft anal fin rays in females, minute urogenital papilla in males, and absence of a dark bar on iris. It has some morphological characteristics similar to Kryptolebias , but other characters more closely align with the rest of Rivulidae . According to the original description it would be the sister taxa of all Rivulidae except Kryptolebias ( Costa, 2004b, 2006a). Unfortunately, it has never been included in any subsequent phylogeny or revision, and its position remains uncertain.