Astyanax douradilho, a new characid fish from the rio Tramandaí system, southern Brazil (Characiformes: Characidae)

Bertaco, Vinicius de Araújo

doi:10.11646/zootaxa.3794.3.10

Cited by 5 publications

(3 citation statements)

References 11 publications

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“…A total of 79 species of Astyanax was described in the last 20 years (Fricke et al, 2019), being one of the fish genera with higher expansion on its richness knowledge. Advances in alpha taxonomy of the ichthyofauna of the Brazilian coastal drainages contributed with 21 of those descriptions, being 11 from the Northeastern Mata Atlântica freshwater ecoregion (e.g., Rangel-Pereira, 2012;Birindelli et al, 2013;Lima et al, 2013;Mattos, Costa, 2018;Barreto et al, 2018;Burger et al, 2019); seven from rivers draining the Laguna dos Patos freshwater ecoregion (e.g., Lucena et al, 2013;Bertaco, Vigo, 2015), one species from the Tramandaí-Mampituba freshwater ecoregion (Bertaco, 2014), one species from the Ribeira de Iguape freshwater ecoregion (Silva et al, 2019), and one from the Southeastern Mata Atlântica freshwater ecoregion (Oliveira et al, 2013). Particularly to the NMAF, nine of the 11 species mentioned are from river basins inserted in the Bahia State, highlighting the rio Paraguaçu basin, with six described species, all of them apparently endemic to this basin (A. brucutu, A. epiagos, A. hamatilis, A. lorien, A. rupestris, and A. sincora).…”

Section: Discussionmentioning

confidence: 99%

A new species of Astyanax (Characiformes: Characidae) from the rio de Contas basin, Bahia, Brazil

et al. 2019

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A new species of Astyanax from tributaries of the rio de Contas, Bahia, Brazil, is described. The new species differs from congeners by having three horizontal series of scales from lateral line to pelvic-fin origin and the distal margin of third infraorbital distinctly separated from vertical and horizontal limbs of preopercle, leaving a broad area not covered by superficial bones. The new species further differs from most congeners by the presence of bony hooks on all fins of mature males. Particularly from congeners occurring in rivers of the Northeastern Mata Atlântica freshwater ecoregion, it further differs by having the highest body depth just anterior to the dorsal-fin origin, 34-37 pored lateral line scales, a vertically elongated conspicuous dark humeral blotch reaching below the lateral line and a conspicuous dark wide midlateral stripe extending from the clear area on the rear of the humeral blotch to the end of middle caudal-fin rays and forming an inconspicuous blotch on caudal peduncle.

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Section: Discussionmentioning

confidence: 99%

A new species of Astyanax (Characiformes: Characidae) from the rio de Contas basin, Bahia, Brazil

et al. 2019

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“…Presently, there are 18 recognized species of Astyanax in the main hydrographic basins of Rio Grande do Sul State (rio Uruguay, laguna dos Patos, and rio Tramandaí) (Lucena et al, 2013a(Lucena et al, , 2013bBertaco, 2014). During a revisionary study of Astyanax from these basins, an endemic new species was recognized from tributaries of the rio Taquari-Antas, rio Jacuí drainage, laguna dos Patos system, which is described herein.…”

Section: Introductionmentioning

confidence: 89%

A new species of Astyanax Baird & Girard (Ostariophysi: Characidae) from the rio Taquari-Antas basin, southern Brazil

2015

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A new Astyanax is described from the rio Taquari-Antas basin, rio Jacuí drainage, laguna dos Patos system, Rio Grande do Sul State, Brazil. The new species is distinguished from its congeners inhabiting the rio Uruguay, laguna dos Patos and rio Tramandaí basins by the presence of two vertically elongated humeral spots, the anterior humeral spot with the upper portion wider than the lower portion and slightly directed forward, 37-39 perforated scales along the lateral line, 14 scale rows around caudal peduncle, 2-4 maxillary tricuspid teeth, 24-28 branched anal-fin rays, bony hooks on all fins of mature males, and conspicuous caudal peduncle spot. Furthermore, the new species differs from its congeners by body depth (37.9-45.9% of standard length), preanal distance (62.4-69.1% of SL), anal-fin base length (29.7-35.6% of SL), and orbital diameter (29.5-38.2% of head length).Uma nova espécie de Astyanax é descrita da bacia do rio Taquari-Antas, drenagem do rio Jacuí, sistema da laguna dos Patos, Rio Grande do Sul, Brasil. A espécie nova distingui-se das suas congêneres que habitam as bacias do rio Uruguai, laguna dos Patos e rio Tramandaí pela presença de duas manchas umerais verticalmente alongadas, a mancha anterior com a porção superior mais larga que a porção inferior e levemente direcionada a frente, 37-39 escamas perfuradas na linha lateral, 14 séries de escamas ao redor do pedúnculo caudal, 2-4 dentes tricuspidados no maxilar, 24-28 raios ramificados na nadadeira anal, ganchos ósseos em todas as nadadeiras dos machos maduros e mancha no pedúnculo caudal conspícua. Além disso, a espécie nova difere de suas congêneres pela altura do corpo (37,9-45,9% do comprimento padrão), distânciapré-anal (62,4-69,1% do CP), comprimento da base da nadadeira anal (29,7-35,6% do CP) e diâmetro orbital (29,5-38,2% do comprimento da cabeça).

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“…It is also one of the most taxonomically complex genera, resulting in varying estimates of species numbers (GÉRY, 1977;GARUTTI, 1999;GARUTTI;BRITSKI, 2000;LIMA et al, 2003). Although Astyanax systematics are still unclear and not fully understood (MENEZES et al, 2007;BERTACO, 2014;SOARES, 2016), the taxon currently has about 150 valid species (ESCHMEYER;FONG, 2018), many of which have been recently discovered (OLIVEIRA, 2017).…”

Section: Introductionmentioning

confidence: 99%

Conservation status of Astyanax biotae (Characiformes: Characidae) in Mato Grosso do Sul, upper Paraná River basin, Brazil

2018

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ResumoEstado de conservação de Astyanax biotae (Characiformes: Characidae) em Mato Grosso do Sul, bacia do alto Paraná, Brasil. Astyanax biotae é uma espécie originalmente descrita de um aluente do rio Paranapanema, bacia do alto rio Paraná. Durante amostragens realizadas em drenagens dos rios Ivinhema e Verde, no sistema do alto Paraná, em Mato Grosso do Sul, exemplares de A. biotae foram coletados em cabeceiras de pequenos riachos e em lagoas de várzea, tanto em Unidades de Conservação como em áreas de agricultura intensiva. Os dados morfomerísticos de 20 indivíduos analisados foram similares aos da série-tipo. Exemplares-testemunhos estão depositados nas coleções ictiológicas da UFMS (ZUFMS), UEMS (CPUEMS) e UNESP (DZSJRP). Com base nos critérios da IUCN, sugerimos a classiicação como Menos Preocupante (LC) no estado de Mato Grosso do Sul, considerando principalmente a inexistência de ameaças efetivas em duas das áreas de ocorrência da espécie, situadas dentro de Unidades de Conservação. No entanto, reforçamos a urgência em medidas para a proteção das regiões de cabeceiras de riachos, a im de evitar o aumento do desmatamento, assoreamento e poluição agrícola, problemas recorrentes no Cerrado, que comprometem severamente a manutenção desses hábitats e suas espécies. É necessário investir em estudos sobre a biologia da espécie e ampliar as amostragens, buscando diminuir os vazios amostrais ainda existentes nas drenagens estaduais. AbstractAstyanax biotae was described from an afluent of the Paranapanema River, in the upper Paraná River basin. During sampling carried out for research projects in the drainage of the Ivinhema and Verde rivers, in the upper Paraná River system, A. biotae individuals were collected in headwaters of small streams and várzea lagoons, both in protected and intensive agriculture areas. The morphometric and meristic data of 20 Revista Biotemas, 31 (4), dezembro de 2018 48 M. J. A. Vilela et al.individuals analyzed were similar to those of the standard series. Vouchers are deposited in the ichthyological collections of UFMS (ZUFMS), UEMS (CPUEMS) and UNESP (DZSJRP). Based on IUCN criteria, we suggest this species be classiied as Least Concern (LC) in Mato Grosso do Sul State, considering the absence of effective threats in two of the occurrence areas, which are located within protected areas. However, we emphasize the establishment of measures to protect headwater regions in order to avoid an increase in deforestation, siltation and agricultural pollution, which are recurrent problems in the Cerrado that severely compromise the maintenance of these habitats and their species. It is necessary to invest in studies about natural history of the species and to increase sampling, seeking to reduce the sample gaps that still exist in the Mato Grosso do Sul drainages.

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Astyanax douradilho, a new characid fish from the rio Tramandaí system, southern Brazil (Characiformes: Characidae)

Cited by 5 publications

References 11 publications

A new species of Astyanax (Characiformes: Characidae) from the rio de Contas basin, Bahia, Brazil

A new species of Astyanax (Characiformes: Characidae) from the rio de Contas basin, Bahia, Brazil

A new species of Astyanax Baird & Girard (Ostariophysi: Characidae) from the rio Taquari-Antas basin, southern Brazil

Conservation status of Astyanax biotae (Characiformes: Characidae) in Mato Grosso do Sul, upper Paraná River basin, Brazil

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