Hasemania piatan, a new characid species (Characiformes: Characidae) from headwaters of Rio de Contas, Bahia, Brazil

Abstract

Hasemania piatan is described from the upper rio de Contas drainage, Bahia, northeastern Brazil. It can be easily distinguished from its congeners by having 18 principal caudal-fin rays. The new species differs further from congeners by a combination of seven branched dorsal-fin rays, six branched pelvic-fin rays, anal-fin base not covered by scales, presence of only five infraorbitals, and presence of a humeral blotch. It also can be distinguished by having 10-13 branched anal-fin rays, 27-32 scales on longitudinal series, 10-12 circumpeduncular scales, and one to three maxillary teeth.Hasemania piatan é descrita para a bacia do alto rio de Contas, Bahia, nordeste do Brasil. Esta pode ser facilmente diferenciada das congêneres pela presença de 18 raios principais na nadadeira caudal. A espécie nova difere ainda das congêneres pela combinação de sete raios ramificados na nadadeira dorsal, seis raios ramificados na nadadeira pélvica, base da nadadeira anal sem escamas, presença de apenas cinco infraorbitais e presença de uma mancha umeral. Pode ainda ser diferenciada por ter 10-13 raios ramificados na nadadeira anal, 27-32 escamas na linha longitudinal, 10-12 escamas ao redor do pedúnculo caudal e um a três dentes maxilares.

New species of Hasemania (Characiformes: Characidae) from Central Brazil, with comments on the endemism of upper rio Tocantins basin, Goiás State

“…The anal-fin base completely naked in Hasemania kalunga, without a sheath of scales, is uncommon in Characidae, but can be found in Astyanax epiagos (see Zanata & Camelier, 2008), Hasemania piatan (see Zanata & Serra, 2010), Iguanodectes spp., in species of the Glandulocaudinae (sensu Menezes & Weitzman, 2009;e.g Weitzman & Malabarba, 1999). Hasemania kalunga differs from Iguanodectinae, Glandulocaudinae and Spintherobolus (Cheirodontinae) species by not sharing the synapomorphies diagnosing these subfamilies (cf.…”

“…Géry (1977) followed Eigenmann and Ellis, and further included the genus in a group he named "Hemigrammus and allied genera". Publications on Hasemania subsequent to Eigenmann's revision, involve mainly the transfer of Pristicharax hanseni to Hasemania hanseni by Böhlke (1958) and Tetragonopterus nanus to Hasemania nana by Géry (1972), and descriptions of new species by Zarske & Géry (1999), Bertaco & Malabarba (2007), and Zanata & Serra (2010).…”

“…Currently, seven valid species are recognized in Hasemania, three with a limited distribution in the rio Paraná basin (H. crenuchoides Zarske & Géry from the upper rio Paraná; H. maxillaris Ellis and H. melanura Ellis from rio Iguaçu), rio São Francisco basin (H. nana); one species from an unknown locality in the state of Goiás, Brazil (H. hanseni (Fowler)), one from the upper rio Tapajós basin (H. nambiquara), and one from the upper rio de Contas drainage (Lima et al, 2003;Bertaco & Malabarba, 2007;Zanata & Serra 2010). In a recent expedition to tributaries from the upper rio Tocantins basin in the Chapada dos Veadeiros, Goiás State, Central Brazil, a new characid species referable to Hasemania was discovered and is described herein.…”

Biogeography of freshwater fishes from the Northeastern Mata Atlântica freshwater ecoregion: distribution, endemism, and area relationships

“…Another putative example involving sister group relationships between coastal and continental rivers is that of Hasemania piatan, a recently described species from a tributary of the upper rio de Contas basin (Zanata & Serra, 2010). Of its seven congeners, four have a limited distribution in the rio Paraná and rio São Francisco basins, one is from an unknown locality in the State of Goiás, one is from a tributary of the upper rio Juruena (tributary of the upper rio Tapajós basin), and one from upper rio Tocantins basin.…”

Ituglanis agreste, a new catfish from the rio de Contas basin, northeastern Brazil (Siluriformes: Trichomycteridae)

“…Fortunately, the three species of Ituglanis known from Bahia (including the one described herein), are found in hydrographic basins that pass through integral protection conservation units: I. paraguassuensis in the rio Paraguaçu basin that passes through the Chapada Diamantina National Park, I. cahyensis in the rio Cahy basin that has part of it course protected by the The discovery of this new species in the rio de Contas basin reinforces the necessity for ichthyofaunal inventories in northeastern Brazil, especially in the numerous isolated coastal watersheds south of rio São Francisco, where more undescribed species are expected to exist (Langeani et al, 2009) (Vari et al, 2010;Zanata & Serra, 2010;Barbosa & Costa, 2011;Rangel-Pereira, 2012;Birindelli et al, 2013). Hence, the case of Ituglanis agreste, together with the recently discovered endemic fish above, suggests that the rio de Contas basin contains several endemic species …”