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Journal Article

A New Species of Sexually Dimorphic Electric Knifefish from the Amazon Basin, Brazil (Gymnotiformes: Apteronotidae)

Carlos David de Santana and Cristina Cox Fernandes
Copeia
Vol. 2012, No. 2 (June 27, 2012), pp. 283-292
Stable URL: http://www.jstor.org/stable/23273222
Page Count: 10
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A New Species of Sexually Dimorphic Electric Knifefish from the Amazon Basin, Brazil (Gymnotiformes: Apteronotidae)
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Abstract

Apteronotus lindalvae, a new species of sexually dimorphic electric knifefish, is described from the Rio Uatumã, Amazon basin, Brazil. This is the first species of Apteronotus, outside the Apteronotus albifrons complex, known to inhabit rapids and waterfalls of Amazonian Rivers, being reophilic. The new species is distinguished from all congeners by a unique feature, the presence of an unpigmented dorsal stripe extending from the tip of the chin to beyond the posterior border of the eye, but never extending as far back as the branchial opening. It is also distinguished by the total number of anal-fin rays and the length of the caudal fin. The description of A. lindalvae increases to 19 the number of species in Apteronotus. Apteronotus lindalvae, uma nova espécie sexualmente dimórfica de peixe elétrico é descrita do rio Uatumã, na bacia Amazônica, Brasil. Apteronotus lindalvae é a primeira espécie de Apteronotus encontrada em corredeiras e cachoeiras dos rios da Amazônia, além destes que fazem parte do complexo Apteronotus albifrons, a ser considerada de hábito reofílico. A espécie nova é diferenciada de todos os congêneres por uma característica exclusiva, a presença de uma faixa clara dorsal que se estende da ponta do focinho até a borda posterior do olho, mas nunca se extendendo além da abertura branquial. Assim como pode ser diferenciada pelo número total de raios da nadadeira anal, e o comprimento da nadadeira caudal. A descrição de A. lindalvae eleva para 19 o número de espécies em Apteronotus.

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