Editorial Type:
Article Category: Research Article
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Online Publication Date: 27 Jun 2012

A New Genus and Species of Cheirodontine Fish from South America (Teleostei: Characidae)

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Page Range: 243 – 250
DOI: 10.1643/CI-11-143
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Ctenocheirodon pristis, a new genus and species of cheirodontine fish from South America is described. The new genus possesses derived ventral procurrent caudal-fin rays and anal-fin rays that support its placement among characids of the tribe Cheirodontini. The new genus and species is diagnosed from the other members of the tribe by the shape of ventral procurrent caudal-fin rays and anal-fin rays.

Ctenocheirodon pristis, um novo gênero e espécie de Cheirodontinae da América do Sul é descrito. O novo gênero possui raios procurrentes ventrais da nadadeira caudal e raios da nadadeira anal derivados, que suportam sua alocação entre os caracídeos da tribo Cheirodontini. O novo gênero e espécie são diagnosticados dos demais táxons da tribo pelo formato dos raios procurrentes ventrais da nadadeira caudal e raios da nadadeira anal.

Copyright: 2012 by the American Society of Ichthyologists and Herpetologists
Fig. 1.
Fig. 1.

Ventral procurrent caudal-fin rays of Ctenocheirodon pristis, paratypes. Top, male, MZUSP 40535, 29.5 mm SL; bottom, female, MZUSP 40535, 26.7 mm SL. Left side, anterior to left. Scale bar  =  1 mm.

Fig. 2.
Fig. 2.

Ctenocheirodon pristis. Top and middle, holotype, male, UFRGS 15606, 31.0 mm SL, photographs of the same specimen in alcohol (top) and in formalin three days after fixation (middle). Bottom, paratype, female, UFRGS 11232, 31.3 mm SL; creek crossing highway GO-112, tributary of Rio Paranã, Povoado de Lagoa Brava, Goiás, Brazil (13°48′48.5″S, 46°52′13″W).

Fig. 3.
Fig. 3.

Anal-fin rays of Ctenocheirodon pristis, paratype, male, MZUSP 40535, 29.5 mm SL. The proximal ends of anal-fin rays have their lepidotrichia bases extended anteriorly (see character 10 in the Discussion section) and the anterior branched anal-fin rays 1 through 5 of males (usually those bearing hooks) are slab-shaped and more expanded in the sagittal plane than comparable rays in females (see character 12 in the Discussion section). Left side, anterior to left. Scale bar  =  1 mm.

Fig. 4.
Fig. 4.

Premaxillary, maxillary, and dentary teeth of Ctenocheirodon pristis, paratype, male, MZUSP 40535, 26.6 mm SL. Left side, anterior to left.

Fig. 5.
Fig. 5.

Map of northeastern South America showing collecting localities of Ctenocheirodon pristis in the upper Rio Tocantins basin. Dot with white star indicates type locality.

Contributor Notes

Associate Editor: R. E. Reis.

Received: 04 Oct 2011
Accepted: 20 Dec 2011
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