Megalebias is considered by most taxonomists as a sub-genera under Austrolebias. It was originally created to separate larger predatory species from smaller ‘prey’ species.
Megalebias Costa, 1998. Costa, W. J. E. M. 1998. Phylogeny and classification of Rivulidae revisited: Origin and evolution of annualism and miniaturization in rivulid fishes (Cyprinodontiformes: Aplocheiloidei). Journal of Comparative Biology 3 (1): 33-92, 37 figs. [description: p. 76]
Type species:Cynolebias wolterstorffi Ahl, 1924, by original designation.