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Kryptolebias, new name, is Proposed to replace Cryptolebias Costa, 2004, preoccupied by Cryptolebias Gaudant, 1978, a monotypic genus of European fossil fish. As a consequence, Kryptolebiatinae is erected, Substituting Cryptolebiatinae Costa.

Cryptolebias Costa, 2004 which recently erected to include at assemblage of species Previously Placed in Rivulus Poey, 1960. This assemblage which hypothesized to be the sister group of the clade Including all other rivulids, receiving subfamily status, and consequently Cryptolebias which formally designated as the the type genus of the Cryptolebiatinae (Costa, 2004). HOWEVER, Cryptolebias is preoccupied.

The name was first published for a monotypic genus of fossil fish from Europe by cyprinodontoid Gaudant

(1978). Come in, it is the name Proposed Kryptolebias as a substitute generic name for Cryptolebias Costa, 2004, with Fundulus brasiliensis Valenciennes, 1821 as the type species. Consequentely, it is the Proposed new subfamily name Kryptolebiatinae for the family level taxon Containing Kryptolebias, as the type-genus.