Xenurobrycon coracoralinae, a new glandulocaudine fish (Ostariophysi: Characiformes: Characidae) from central Brazil

Moreira, Cristiano R.

doi:10.2988/0006-324x(2005)118[855:xcangf]2.0.co;2

Cited by 8 publications

(10 citation statements)

References 3 publications

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“…Over a decade later, Costa & Le Bail (1999) added 24 Neotropical freshwater fish species to that list including four characiforms, seven siluriforms and 13 cyprinodontiforms. Since then, a great number of miniature Neotropical freshwater fishes have been discovered (e.g., Moreira, 2005;Schaefer et al, 2005;Caires & Figueiredo, 2011;Dutra et al, 2012;Román-Valencia et al, 2012;Netto-Ferreira et al, 2013a), quite a number of which were placed into new monotypic genera (e.g., Géry & Romer, 1997;Bührnheim et al, 2008;Zarske, 2010;Ribeiro et al, 2012;Netto-Ferreira et al, 2013b;Mattox et al, 2013). Since Weitzman & Vari's (1988) and Costa & Le Bail's (1999) lists, the Check List of Freshwater Fishes of South and Central America has been published , which helped to organize knowledge on Neotropical species and highlighted many miniature forms (sensu Weitzman & Vari, 1988) not included in previous lists.…”

Section: Introductionmentioning

confidence: 99%

Priocharax nanus, a new miniature characid from the rio Negro, Amazon basin (Ostariophysi: Characiformes), with an updated list of miniature Neotropical freshwater fishes

Mattox²,

2014

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Priocharax nanus, new species, is described from the rio Negro, Brazil. It is a miniature fish that retains as an adult the larval rayless pectoral fin, a diagnostic character of the genus. Priocharax nanus possesses fewer reductive features compared to congeners, P. ariel and P. pygmaeus, from which it can be distinguished by the presence of i,6 pelvic-fin rays (vs. i,5), the presence of the claustrum (vs. claustrum absent) and the presence of two postcleithra (vs. postcleithra absent). An updated list of 213 species of miniature Neotropical freshwater fishes is presented. The greatest diversity among them is represented by the Characiformes with 87 miniature species.Priocharax nanus, espécie nova, é descrita do rio Negro, Brasil. É um peixe miniatura que retém no adulto a forma larval da nadadeira peitoral, um caráter diagnóstico do gênero. Priocharax nanus possui um número menor de caracteres redutivos quando comparado aos congêneres, P. ariel and P. pygmaeus, dos quais pode ser distinguida pela presença de i,6 raios na nadadeira pélvica (vs. i,5), presença do claustrum (vs. claustrum ausente) e presença de dois pós-cleitros (vs. pós-cleitros ausentes). Uma lista atualizada de 213 espécies de peixes miniatura de água doce neotropicais é apresentada. A maior diversidade entre eles é representada pelos Characiformes, com 87 espécies miniatura.Key words: Heterocharacinae, Miniaturization, Reductive characters. (Weitzman & Vari, 1987). More recently, Priocharax ariel was also recorded in the region of Santa Isabel do Rio Negro, rio Negro basin (Lima & Toledo-Piza, 2001) and P. pygmaeus was collected from a small tributary of rio Solimões, in Amazonas, Brazil (Oliveira et al., 2009). Weitzman & Vari (1987) listed six diagnostic characters for Priocharax, the most conspicuous of which is the presence of a rayless pectoral fin fold in the adult, which is otherwise restricted to larval stages of characiforms and teleosts in general. Priocharax species also have the upper and lower jaws with a high number of tiny conical teeth, the adults are diminutive in size being among the smallest characiforms known, specimens have 16-22 branched anal-fin rays and only five branched pelvic-fin rays. In addition to the two species of Priocharax, the only other Characidae known to us that consistently has i,5 pelvic-fin rays is Cyanogaster noctivaga Mattox, Britz, Toledo-Piza & Marinho, another miniature characid from the rio Negro (Mattox et al., 2013).One year after describing the diminutive Priocharax, Weitzman & Vari (1988) provided a comprehensive review on miniaturization of South American freshwater fishes including a list of 85 species that either matured under 20 mm SL or did not exceed a maximum of 26 mm SL. The authors included 49 species of Characiformes in that original list, Priocharax nanus, new miniature species 230 nearly 60% of the total number of miniature species in South American freshwaters. Of their 49 miniature Characiformes, 46 were classified in the Characidae (including eight species of characidiines now...

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Section: Introductionmentioning

confidence: 99%

Priocharax nanus, a new miniature characid from the rio Negro, Amazon basin (Ostariophysi: Characiformes), with an updated list of miniature Neotropical freshwater fishes

Mattox²,

2014

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“…In addition to their diminutive size, the lack of infraorbital bones 4 and 5 in X. varii might also be associated with miniaturization events, as suggested by Weitzman & Vari (1988) and further discussed by ToledoPiza et al (2014) and Mattox et al (2016). Comparatively, the infraorbital series is almost complete in X. heterodon, X. macropus, X. pteropus and X. polyancistrus, which present infraorbitals 1 to 5 (Moreira, 2005). On the other hand, X. coracoralinae shares with X. varii, the lack of those bones, but also lacks infraorbital 1, a unique condition among Xenurobrycon species (Moreira, 2005) The presence of a set of lamellar processes on segments 3-5 on the eighth ray of the caudal-fin lower lobe (see "Sexual Dimorphism") is an unusual feature among xenurobyconin species.…”

Section: Discussionmentioning

confidence: 80%

“…Comparatively, the infraorbital series is almost complete in X. heterodon, X. macropus, X. pteropus and X. polyancistrus, which present infraorbitals 1 to 5 (Moreira, 2005). On the other hand, X. coracoralinae shares with X. varii, the lack of those bones, but also lacks infraorbital 1, a unique condition among Xenurobrycon species (Moreira, 2005) The presence of a set of lamellar processes on segments 3-5 on the eighth ray of the caudal-fin lower lobe (see "Sexual Dimorphism") is an unusual feature among xenurobyconin species. Besides X. varii, similar structures were found only in X. coracoralinae and X. macropus, however, in the latter species the dorsal, unpaired process is lacking, and the paired, ventral processes are distinctly larger, forming a conspicuous flange-like process that extends across two segments, as described in Weitzman & Fink (1985: fig.…”

Section: Discussionmentioning

confidence: 99%

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A new miniature of Xenurobryconini (Characiformes: Characidae) from the rio Tapajós basin, Brazil

et al. 2016

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A new species of Xenurobrycon is described from tributaries of the rio Tapajós, Pará, Brazil. It is diagnosed from all congeners by the dark color of the posterior half of both caudal-fin lobes, the presence of infraorbitals one, two, and three, the presence of a set of lamellar processes on eighth principal caudal-fin ray of mature males, the presence of bony hooks similar in size or decreasing posteriorly on last unbranched and first 9-12 branched anal-fin rays of mature males, the presence of only conical teeth on both jaws, the lack of the adipose fin and the presence of 15-18 predorsal scales. The description of the new species increases the number of species in Xenurobrycon to six. An updated key to the species of the genus is provided.Uma espécie nova de Xenurobrycon é descrita de tributários do rio Tapajós, Pará, Brasil. Esta é diagnosticada de todas as congêneres pela coloração escura da metade posterior de ambos os lobos da nadadeira caudal, pela presença dos infraorbitais um, dois e três, pela presença de um conjunto de processos laminares no oitavo raio principal do lobo inferior da nadadeira caudal em machos maduros, pela presença de ganchos no último raio indiviso e primeiros 9-12 raios ramificados da nadadeira anal em machos maduros, estes com tamanho similar ou diminuindo de tamanho posteriormente, pela presença de apenas dentes cônicos nas maxilas, pela ausência de nadadeira adiposa e pela presença de 15-18 escamas pré-dorsais. A descrição da espécie nova aumenta o número de espécies em Xenurobrycon para seis. Uma chave atualizada para as espécies do gênero é fornecida.

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“…Além desses, a análise bibliográfica apontou um truncamento nesta etapa do desenvolvimento em diversos outros Characiformes de pequeno porte, tais como em representantes dos gêneros Xenurobrycon (Weitzman & Fink, 1985;Moreira, 2005), Paracheirodon (Weitzman & Fink, 1983), Spintherobolus (Weitzman & Malabarba, 1999), Nannostomus (Weitzman, 1964) e Tricuspidalestes (Zanata & Vari, 2005).…”

Section: Dos Exemplares De Characiformes Analisados Estas Reduções Funclassified

Canais e poros do sistema látero-sensorial cefálico de Characiformes (Ostariophysi): anatomia e seu significado filogenético

Pastana¹

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Xenurobrycon coracoralinae, a new glandulocaudine fish (Ostariophysi: Characiformes: Characidae) from central Brazil

Cited by 8 publications

References 3 publications

Priocharax nanus, a new miniature characid from the rio Negro, Amazon basin (Ostariophysi: Characiformes), with an updated list of miniature Neotropical freshwater fishes

Priocharax nanus, a new miniature characid from the rio Negro, Amazon basin (Ostariophysi: Characiformes), with an updated list of miniature Neotropical freshwater fishes

A new miniature of Xenurobryconini (Characiformes: Characidae) from the rio Tapajós basin, Brazil

Canais e poros do sistema látero-sensorial cefálico de Characiformes (Ostariophysi): anatomia e seu significado filogenético

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