Dastilbe is an extinct genus of prehistoric marine & freshwater ray-finned fish from the Early Cretaceous of Brazil.

[3][4] Other studies have found extensive morphological variation within D. crandalli, and have suggested that it may represent a species complex.

minor' Santos, 1975 from the Aptian-aged Marizal Formation of Bahia, was assigned to Dastilbe as a nomen nudum, but was revived and reclassified into its own genus (Nanaichthys) in 2012.

[6] The species D. moraesi Santos, 1955 from the Barremian/Aptian of Minas Gerais, Brazil (Areado Formation) was placed in its own genus, Francischanos, in 2022.

It was probably an anadromous fish, tolerant of hypersalinity and subjected to frequent mass mortality.