Costa described the genus Prorivulus original designationed to the species auriferus. The genus is monotypic and is discussed.

According to osteological (bone) studies the species must be placed between Rivulus and Kryptolebias. Many meristic small differences to other Rivulus families including Kryptolebias and Rivulus are described such as minute genital papilles in males (versus larger in Rivulus and Kryptolebias).

Etymology: From the Latin pro (a prefix meaning priority in space or time) and rivulus (stream, and also a nominal rivulid genus), referring to the basal position of the genus regarding Rivulus and all the annual fish rivulid genera. Gender masculine.

Behaviour:

no info available yet. I am desperately looking for this species. I assume however there will be no large differences in the way of reproduction with similar members of the genus Rivulus