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1 June 2014 The South American Electric Glass Knifefish Genus Distocyclus (Gymnotiformes: Sternopygidae): Redefinition and Revision
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Abstract

Electric glass knifefishes of the genus Distocyclus, family Sternopygidae, are reviewed. Features previously utilized to diagnose Distocyclus were found uninformative as to whether the two species originally assigned to the genus are sister taxa. Distocyclus goajira was found to lack the derived features present in the type-species of the genus, D. conirostris and instead shares derived features with Archolaemus, Eigenmannia, and/or Japigny; however, the relationships of Distocyclus goajira among those genera cannot be resolved. In light of this evidence, Distocyclus is restricted to its type species, D. conirostris, which is defined on a series of derived characters, and D. goajira is assigned as incertae sedis in the Eigenmanniinae under a new combination of “Eigenmannia” goajira. Distocyclus conirostris is redescribed on the basis of multiple samples from across the Amazon, Essequibo, and Orinoco river basins.

Os peixes elétricos do gênero Distocyclus, família Sternopygidae, são revisados. Os caracteres diagnósticos previamente propostos para Distocyclus se mostraram não informativos em relação as duas espécies originalmente alocadas neste gênero como espécies irmãs. Distocyclus goajira não apresenta os caracteres derivados presentes na espécie tipo do gênero, D. conirostris, e ainda compartilha caracteres derivados em diferentes combinações com Archolaemus, Eigenmannia e Japigny. Baseado na presente evidência, Distocyclus é restringido a sua espécie tipo, D. conirostris que é definido por uma série de caracteres derivados e D. goajira é considerada incertae sedis em Eigenmanniinae, sob a nova combinação de “Eigenmannia” goajira. Distocyclus conirostris é redescrito com base em várias amostras ao longo das bacias dos rios Amazonas, Essequibo e Orinoco.

© 2014 by the American Society of Ichthyologists and Herpetologists
Guilherme Moreira Dutra, Carlos David de Santana, Richard P. Vari, and Wolmar Benjamin Wosiacki "The South American Electric Glass Knifefish Genus Distocyclus (Gymnotiformes: Sternopygidae): Redefinition and Revision," Copeia 2014(2), (1 June 2014). https://doi.org/10.1643/CI-13-066
Received: 7 June 2013; Accepted: 1 February 2014; Published: 1 June 2014
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