Austrolebias univentripinnis sp. nov. (Teleostei: Cyprinodontiformes: Rivulidae): a new annual killifish from the Mirim Lagoon basin, southern Brazil. Author Wilson J. E. M. Costa Author Morevy M. Cheffe text Zootaxa 2005 1052 41 48 http://www.zoobank.org/urn:lsid:zoobank.org:pub:F2E774DF-96BA-4F5E-AEF4-24F632537F8B journal article z01052p041 [[ Austrolebias Costa ]] The genus Austrolebias Costa comprises a diversified clade of Cynolebiatini annual killifishes endemic to southern Brazil, Paraguay, northern Argentina and Uruguay (Costa, 1998, 2002). Its included species inhabit temporary pools characteristic of all river drainages in this region, including the Parana-Paraguay-Uruguay River system and the Patos-Mirim lagunar system. The latter system is located near the coast of southern Brazil and northeastern Uruguay, and is home to ten species of Austrolebias : A. adloffi (Ahl) , A. arachan Loureiro, Azpelicueta & Garcia , A. charrua Costa & Cheffe , A. cyaneus (Amato) , A. gymnoventris (Amato) , A. luteoflammulatus (Vaz-Ferreira, Sierra & Scaglia) , A. jaegari Costa & Cheffe , A. minuano Costa & Cheffe , A. nigrofasciatus Costa & Cheffe , and A. viarius (Vaz-Ferreira, Sierra & Scaglia) (Costa & Cheffe, 2001, 2002; Costa, 2003; Loureiro et al., 2004). A new species from the Jaguarao River drainage, which is tributary to the Mirim Lagoon, having apomorphic features such as triangular anal fin in females, pelvic-fin bases medially fused, and urogenital papilla attached to anal fin in males is herein described.