Austrolebias varzeae, a new annual fish from the upper rio Uruguay basin, southern Brazil (Cyprinodontiformes: Rivulidae)

Abstract

varzeae n. sp. is described from rio da Várzea floodplains, upper rio Uruguay basin, southern Brazil. It seems to be closely related to A. carvalhoi (Myers), with which it shares a similar color pattern of male and an apomorphic morphology of the autopalatine. The new species differs from A. carvalhoi by having more anal-fin rays in males and more caudal-fin rays. Austrolebias varzeae is distinguished from all other species of the genus by a unique color pattern, in which there are three distinctively darker and narrower bars on the anterior portion of male flank. Putative close relationships between A. varzeae and A. carvalhoi suggest a closely related biogeographic history between upper Uruguay and upper Iguaçu River basins, corroborated by a biogeographic pattern of the anablepid genus Jenynsia.Austrolebias varzeae sp. n. é descrita da várzea do rio da Várzea, bacia do rio Uruguai superior, sul do Brasil. Ela parece estar estreitamente aparentada a A. carvalhoi, com a qual compartilha um padrão de colorido similar e uma morfologia apomórfica do autopalatino. A nova espécie difere de A. carvalhoi por possuir mais raios na nadadeira anal de machos e mais raios na nadadeira caudal. Austrolebias varzeae se distingue de todas as espécies do gênero por um padrão de colorido exclusivo, no qual há três barras distintivamente mais estreitas e mais escuras na porção anterior do flanco do macho. As supostas estreitas relações de parentesco entre A. varzeae e A. carvalhoi sugerem uma história biogeográfica intimamente relacionada entre as bacias do rio Uruguai e do rio Iguaçu superiores, corroborada por um padrão biogeográfico do gênero anablepídeo Jenynsia.

Austrolebias paucisquama (Cyprinodontiformes: Rivulidae), a new species of annual killifish from southern Brazil

“…Most Austrolebias species inhabit lowlands and inundated areas adjacent to permanent waters, in altitudes usually lower than 150 m (Costa et al, 2004). These species seem to have larger areas of distribution (e.g.…”

Checklist of the ichthyofauna of the Rio Negro basin in the Brazilian Amazon

“…First, a compilation of the records of species originally described based on specimens collected in the Rio Negro basin or that included that basin in their distribution range was made based in the catalogues of Reis et al (2003), Buckup et al (2007), Ferraris-Jr (2007), and Ferraris-Jr et al (2017). Additional information from taxonomic revisions and species descriptions from 2003 to 2019 were also included: Armbruster (2003), Britto and Lima (2003), Costa (2003a, 2003b), Vari and Lima (2003), Costa (2004a, 2004b), Crampton et al (2004), Hrbek et al (2004), Lehmann and Reis (2004), Malabarba (2004), Zanata and Toledo-Piza (2004), Zarske et al (2004), Ferraris-Jr et al (2005), Kullander and Ferreira (2005), Lundberg and Akama (2005), Reis et al (2005), Sabaj (2005), Sousa and Rapp Py-Daniel (2005), Vari et al (2005), Zanata and Lima (2005), Armbruster and Page (2006), Bührnheim and Malabarba (2006), Ferreira and Lima (2006), Kullander and Ferreira (2006), Mautari and Menezes (2006), Mattox et al (2006), Menezes (2006), de Santana and Nogueira (2006), Zarske and Géry (2006), Parisi et al (2006), Lundberg and Cox-Fernandes (2007), Bührnheim and Malabarba (2007), Buitrago–Suárez and Burr (2007), Ferraris-Jr (2007), Lucena (2007), Rodriguez and Reis (2007), Staeck and Schindler (2007), Zarske and Géry (2007), Armbruster (2008), Birindelli et al (2008), Orti et al (2008), Sabaj and Birindelli (2008), Sabaj et al (2008), Sidlauskas and Vari (2008), Rapp Py-Daniel and Fichberg (2008), Rocha et al (2008a, 2008b), Thomas and Rapp Py-Daniel (2008), Birindelli and Britski (2009), de Santana and Vari (2009), Lima and Sousa (2009), Lima et al (2009), Marinho (2009), Marinho and Lima (2009), Oyakawa and Mattox (2009), Paixão and Toledo-Piza (2009), Sul...…”

First record of annual killifish Austrolebias melanoorus (Amato, 1986) (Cyprinodontiformes: Rivulidae) from Brazil, with data on habitat and conservation

“…Most species of Austrolebias live in lowlands adjacent to permanent bodies of water at altitudes below 150 m (Costa et al., 2004). These species have greater potential to spread throughout the floodplains, because they are endemic to lower altitudes (Costa, 2006).…”