Abstract
Hypsolebias janaubensis (Costa, 2006), popularly known as the Cloud Fish of Janaúba, is an annual killifish species (Cyprinodontiformes: Rivulidae) which, similar to many other species in that group, is threatened with extinction, being currently classified as Critically Endangered (CR). Despite evoking great interest due to their specialized life cycles, morphological studies on these fi…