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 JWVL 135388 Rivulidae Austrolebias CoL Animalia Cyprinodontiformes 60 Chordata species alexandri Rivulidae Austrolebias CoL Animalia Cyprinodontiformes 60 Chordata species alexandri  Diagnosis Distinguished from remaining taxa of the genus in apomorphically having the pectoral fins dark gray, with bright blue iridescence in males.