Review of the family Rivulidae (Cyprinodontiformes, Aplocheiloidei) and a molecular and morphological phylogeny of the annual fish genus Austrolebias Costa 1998 Author Loureiro, Marcelo Author Sá, Rafael de Author Serra, Sebastián W. Author Alonso, Felipe Author Lanés, Luis Esteban Krause Author Volcan, Matheus Vieira Author Calviño, Pablo Author Nielsen, Dalton Author Duarte, Alejandro Author Garcia, Graciela text Neotropical Ichthyology 2018 2018-10-18 16 3 1 20 journal article 10.1590/1982-0224-20180007 b7b6ef8f-c8e6-43ad-8b21-5450b4090b75 1982-0224 3709839 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.