A new species of Astyanax (Characiformes, Characidae) from Uruguay river basin in Argentina, with remarks on hook presence in Characidae

Azpelicueta, María de las Mercedes; García, José Omar

doi:10.5962/bhl.part.80128

Cited by 27 publications

(22 citation statements)

References 9 publications

(13 reference statements)

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“…The presence of hooks on the anal-and pelvic-fin rays and sometime caudal-fin rays of males is often found in several genera and subfamilies of the Characidae (Azpelicueta & Garcia, 2000;Malabarba & Weitzman, 2003), and usually represent a secondary sexual character. The presence of bony hooks on the dorsal-fin rays is known to occur only in two Hyphessobrycon species: H.…”

Section: Discussionmentioning

confidence: 99%

A new species of Hyphessobrycon (Teleostei: Characidae) from the upper rio Tocantins drainage, with bony hooks on fins

2005

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A new species of characid, Hyphessobrycon hamatus, is described from the upper rio Tocantins, Goiás, Brazil. The new species is distinguished from all other Hyphessobrycon species by the presence of bony hooks on dorsal, anal, pelvic, and pectoral fins of males, the two black humeral spots, the 4 or 5 teeth in the inner series of the premaxilla, a maxilla with 2-3 teeth, the iiiv, 16-18 anal-fin rays, and a lateral line with 10-32 perforated scales and 33-35 scales in a longitudinal series.Uma nova espécie de caracídeo, Hyphessobrycon hamatus é descrita para os tributários do alto rio Tocantins, Goiás, Brasil. A nova espécie distingue-se das demais espécies de Hyphessobrycon pela presença de ganchos nos raios das nadadeiras dorsal, anal, pélvica e peitoral dos machos, duas manchas umerais pretas verticalmente alongadas, 4-5 dentes na série interna do pré-maxilar, 2-3 dentes no maxilar, 16-18 raios ramificados na nadadeira anal, 10-32 escamas perfuradas na linha lateral, e 33-35 escamas em uma série longitudinal.

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Section: Discussionmentioning

confidence: 99%

A new species of Hyphessobrycon (Teleostei: Characidae) from the upper rio Tocantins drainage, with bony hooks on fins

2005

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“…The presence of hooks on the anal-and pelvic-fin rays and sometime caudal-fin rays of males is often found in several genera and subfamilies of the Characidae (Azpelicueta & Garcia, 2000;Malabarba & Weitzman, 2003), and usually represents a secondary sexual character. However, the occurrence of bony hooks in all fins, including dorsal, caudal, and pectoral fins of males is uncommon in characids.…”

Section: Discussionmentioning

confidence: 99%

A new species of Hemibrycon (Teleostei: Characiformes: Characidae) from the río Ucayali drainage, Sierra del Divisor, Peru

et al. 2007

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A new characid species, Hemibrycon divisorensis, is described from the río Ucayali drainage, Loreto, Peru. The new species is distinguished from all Hemibrycon species by the presence of a wide black asymmetrical spot covering base of caudal-fin rays and extending along entire length of caudal-fin rays 9 to 12-13 (except from H. surinamensis), and a black band in the lower half of the caudal peduncle extending from the region above the last anal-fin rays to the caudal-fin base. Furthermore, it is distinguished from most species of the genus by the number of scale rows below the lateral line (4-5 vs 5-9), except H. jabonero, H. microformaa, H. orcesi, and H. surinamensis. It differs from these species by scale and fin ray counts and color pattern. The lack of a supraorbital in Hemibrycon species is discussed and confirmed.Uma nova espécie de caracídeo, Hemibrycon divisorensis, é descrita para a bacia do río Ucayali, Loreto, Peru. A nova espécie distingue-se das demais espécies de Hemibrycon pela presença de uma ampla mancha preta assimétrica na base dos raios da nadadeira caudal estendida até a extremidade dos raios 9 a 12 ou 13 (exceto de H. surinamensis), e de uma faixa preta na metade inferior do pedúnculo caudal desde a região acima dos últimos raios da nadadeira anal até a base da nadadeira caudal. Ela distingue-se da maioria das espécies do gênero pelo número de escamas abaixo da linha lateral (4-5 vs 5-9), exceto de H. jabonero, H. microformaa, H. orcesi e H. surinamensis. Ela difere destas espécies pela contagem de escamas, raios das nadadeiras e colorido padrão. Discute-se e confirma-se a ausência do osso supraorbital em Hemibrycon.

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“…Moreover, Astyanax burgerai possesses relatively fewer branched analfin rays (18)(19) and is morphologically similar to what is traditionally defined as the "Astyanax scabripinnis species complex" (Moreira-Filho & Bertollo, 1991;Bertaco & Malabarba, 2001;Bertaco & Lucena, 2006), a group that nowadays informally assembles sixteen described species, plus A. burgerai described herein, A. jordanensis Alcaraz et al (this volume), and possibly A. turmalinensis. To distinguish A. Astyanax vermilion exhibits a series of sexually dimorphic characters relatively common in small characids and recently discussed elsewhere (e.g., Garutti, 1990;Azpelicueta & Garcia, 2000;Malabarba & Weitzman, 2003), concerning presence of hooks on anal fin. Nevertheless, the species has external differences between males and females not commonly described for Astyanax species, such as distinctness in the color pattern of body and fins, together with morphometric traits (see details under "Sexual dimorphism" section of the species).…”

Section: Discussionmentioning

confidence: 99%

“…The arithmetic mean used in some instances is represented by X. Specimens utilized for comparative analysis are listed under 'Comparative material examined' and other comparisons provided elsewhere were based on the literature information (Eigenmann, 1921(Eigenmann, , 1927Azpelicueta & Garcia, 2000;Bertaco & Malabarba, 2001;Almirón et al, 2002;Haluch & Abilhoa, 2005;Bertaco & Lucena, 2006;Triques et al, 2006;Abilhoa & Duboc, 2007;Zanata & Camelier, 2008 …”

Section: Methodsmentioning

confidence: 99%

Astyanax vermilion and Astyanax burgerai: new characid fishes (Ostariophysi: Characiformes) from Northeastern Bahia, Brazil

Zanata

Camelier

2009

Neotrop. ichthyol.

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Two new Astyanax species, A. vermilion, from rio Almada and rio Cachoeira, and A. burgerai, from rio Almada, Bahia State, Brazil, are described. Astyanax vermilion is distinguished from most of its congeners and from all other Astyanax species known from northeastern Brazilian drainages by having distal portion of pelvic fins dark, a combination of sexually dimorphic characters, posteroventral portion of body and fins (except pectoral) reddish in life, and inconspicuous humeral and caudal spots. It also differs by having highest body depth just anterior of dorsal-fin origin, 32-34 lateral-line scales, and presence of one or two maxillary teeth. Astyanax burgerai is diagnosed by the presence of two vertically elongated humeral blotches, absence of a conspicuous and broad dark midlateral stripe (at least on anterior half of body), body highest along vertical slightly behind midlength of pectoral fin, 31-34 lateral-line scales, and two or three teeth on premaxillary outer series.Duas espécies novas de Astyanax, A. vermilion, do rio Almada e rio Cachoeira, e A. burgerai, do rio Almada, Estado da Bahia, Brasil, são descritas. Astyanax vermilion distingue-se da maioria de suas congêneres e de todas as espécies de Astyanax conhecidas das drenagens do Nordeste do Brasil por ter porção distal da nadadeira pélvica escurecida, uma combinação de caracteres sexualmente dimórficos, porção póstero-ventral do corpo e nadadeiras (exceto peitoral) avermelhadas em vida e manchas umeral e caudal inconspícuas. Difere também por ter maior altura do corpo imediatamente anterior à origem da nadadeira dorsal, 32-34 escamas na linha lateral e presença de um ou dois dentes no maxilar. Astyanax burgerai é diagnosticada pela presença de duas manchas umerais alongadas verticalmente, ausência de faixa lateral larga e conspícua, ao menos na metade anterior do corpo, maior altura do corpo na vertical situada levemente posterior à metade da nadadeira peitoral, 31-34 escamas na linha lateral e dois ou três dentes na série externa do pré-maxilar.

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A new species of Astyanax (Characiformes, Characidae) from Uruguay river basin in Argentina, with remarks on hook presence in Characidae

Cited by 27 publications

References 9 publications

A new species of Hyphessobrycon (Teleostei: Characidae) from the upper rio Tocantins drainage, with bony hooks on fins

A new species of Hyphessobrycon (Teleostei: Characidae) from the upper rio Tocantins drainage, with bony hooks on fins

A new species of Hemibrycon (Teleostei: Characiformes: Characidae) from the río Ucayali drainage, Sierra del Divisor, Peru

Astyanax vermilion and Astyanax burgerai: new characid fishes (Ostariophysi: Characiformes) from Northeastern Bahia, Brazil

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