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Zootaxa: a New Snake of the Genus Atractus Wagler, 1828

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Zootaxa: a New Snake of the Genus Atractus Wagler, 1828 Zootaxa 1378: 19–35 (2006) ISSN 1175-5326 (print edition) www.mapress.com/zootaxa/ ZOOTAXA 1378 Copyright © 2006 Magnolia Press ISSN 1175-5334 (online edition) A new snake of the genus Atractus Wagler, 1828 (Reptilia: Squamata: Colubridae) from Kaieteur National Park, Guyana, northeastern South America PHILIPPE J. R. KOK Department of Vertebrates, Royal Belgian Institute of Natural Sciences, 29 rue Vautier, B-1000 Brussels, Belgium Abstract A new colubrid snake of the genus Atractus Wagler 1828 is described from Kaieteur National Park, west-central Guyana. The new species differs from all other congeners by the combination of two postoculars, 15 dorsal scale rows, eight supralabials, seven to eight infralabials, loreal much longer than high, six maxillary teeth, and a color pattern consisting of irregular red or pale red markings, sometimes forming an incomplete broken dorsolateral stripe, on a medium brown to brownish black ground color, and heavy brownish black mottling on a yellowish cream venter. A key to the species of the genus Atractus from Guyana is provided. Key words: Reptilia, Colubridae, Atractus tamessari sp. nov., Systematics, Kaieteur National Park, Guyana, Guiana Shield Introduction Snakes of the genus Atractus are widely distributed in the Neotropics, from Panama to northern Argentina (Giraudo & Scrocchi 2000, Myers 2003). Most of the nearly 100 species comprising the genus have restricted distributions. Many species have confused taxonomic status, and obviously a major revision is needed (Hoogmoed & Prudente 2003, Myers 2003, Schargel & Castoe 2003). The Guiana Shield region has a high diversity of Atractus, with 21 species currently recognized (Hoogmoed 1980, Silva Haad 2004, Avila- Pires 2005). Only four species are confirmed from Guyana (Avila-Pires 2005), a country where the knowledge of the herpetofaunal diversity is still very limited (Ernst et al. 2005, Donnelly et al. 2005). During the course of our ongoing study of the herpetological richness and community structure in Kaieteur National Park, Guyana, 33 snake species have been recorded. We Accepted by P. David: 30 Oct. 2006; published: 11 Dec. 2006 19.
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