The South American annual killifish genus Austrolebias (Teleostei: Cyprinodontiformes: Rivulidae): phylogenetic relationships, descriptive morphology and taxonomic revision. Wilson J. E. M. Costa Zootaxa 2006 1213 1 162 JWWR 653304 Rivulidae Austrolebias CoL Animalia Cyprinodontiformes 31 Chordata species robustus Rivulidae Austrolebias CoL Animalia Cyprinodontiformes 31 Chordata species cinereus  Diagnosis Clade supported by a wide second basibranchial, with pronounced lateral tips, and an obliquely positioned medial process of the second pharyngobranchial. Larger adult males also have a unique color pattern consisting of homogeneous dark gray coloration on flank, sometimes with narrow light lines, but never with bright markings.