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.References
Avila-Pires, T.C.S. (2005) Reptiles. In: Hollowell, T., and Reynolds, R.P. (Eds.), Checklist of the terrestrial vertebrates of the Guiana Shield. Bulletin of the Biological Society of Washington, 13, pp. 24–40.
Boie, F. (1827) Bemerkungen über Merrem’s Versuch eines Systems der Amphibien. Marburg.1820. Erste Lieferung: Ophidier. Isis von Oken, 20, 508–566.
Boulenger, G.A. (1894) Catalogue of the Snakes in the British Museum (Natural History), Volume II. Taylor and Francis, London, 382 pp.
Chippaux, J.-P. (1986) Les Serpents de la Guyane Française. Cayenne. ORSTOM Faune Tropicale, 27, 165 pp.
Cole, C.J. & Kok, P.J.R. (2006) A New Species of Gekkonid Lizard (Sphaerodactylinae: Gonatodes) from Guyana, South America. American Museum Novitates, 3524, 1–13.
Cunha, O.R. & Nascimento, F.P. (1983) Ofídios da Amazônia XX: as espécies de Atractus Wagler, 1828, na Amazônia oriental e Maranhão (Ophidia, Colubridae). Boletim do Museu Paraense Emílio Goeldi, 123, 1–38.
Cunha, O.R. & Nascimento, F.P. (1984) Ofídios da Amazônia XXI: Atractus zidoki no leste do Pará e notas sobre A. alphonsehogei e A. schach (Ophidia, Colubridae). Boletim do Museu Paraense Emílio Goeldi, new series, 1, 219–228.
Cunha, O.R. & Nascimento, F.P. (1993) Ofídios da Amazônia. As cobras da região leste do Pará. Boletim do Museu Paraense Emílio Goeldi, 9, 1–191.
Dixon, J.R. & Soini, P. (1977) The reptiles of the upper Amazon Basin, Iquitos region, Peru. II. Crocodilians, turtles and snakes. Contributions in Biology and Geology of the Milwaukee Public Museum, 12, 1–91.
Dixon, J.R., Thomas, R.A. & Greene, H.W. (1976) Status of the neotropical snake Rhabdosoma poeppigi Jan, with notes on variation in Atractus elaps (Günther). Herpetologica, 32, 221–227.
Donnelly, M.A., Chen, M. & Watkins, G.G. (2005) Sampling amphibians and reptiles in the Iwokrama Forest ecosystem. Proceedings of the Academy of Natural Sciences of Philadelphia, 154, 55–69.
Dowling, H.G. (1951) A proposed standard system of counting ventrals in snakes. British Journal of Herpetology, 1, 97–99.
Dowling, H.G. & Savage, J.M. (1960) A guide to snake hemipenis: a survey of basic structure and systematic characteristics. Zoologica, 45, 17–28.
Duellman, W.E. (1978) The biology of an equatorial herpetofauna in Amazonian Ecuador. Miscellaneous Publications. Museum of Natural History of the University of Kansas, 65, 1–352.
Ernst, R., Rödel, M.-O. & Arjoon, D. (2005) On the cutting edge – The anuran fauna of the Mabura Hill Forest Reserve, Central Guyana. Salamandra, 41, 179–194.
Fernandes, R. (1995) A new species of snake in the genus Atractus (Colubridae: Xenodontinae) from northeastern Brazil. Journal of Herpetology, 29, 416–419.
Filippi, F. De (1840) Catalogo ragionato e descrittivo della raccolta de serpenti del Museo dell' I.R. Universitá di Pavia. Biblioteca Italiana, 99, 65 pp.
Gasc, J.-P. & Rodrigues, M.T. (1979) Une nouvelle espèce du genre Atractus (Colubridae, Serpentes) de la Guyane française. Bulletin du Muséum national d'Histoire naturelle de Paris, 1, 547–557.
Gasc, J.-P. & Rodrigues, M.T. (1980) Liste préliminaire des Serpents de la Guyane française. Bulletin du Muséum national d'Histoire naturelle de Paris, 2, 559–598.
Giraudo, A.R. & Scrocchi, G. (2000) The genus Atractus (Serpentes: Colubridae) in north-eastern Argentina. Herpetological Journal, 10, 81–90.
Gorzula, S. & Señaris, J.C. (1999) Contribution to the herpetofauna of the Venezuelan Guayana. Part I. A Data Base. Scientia Guaianae, 8, 1–269.
Günther, A. (1858) Catalogue of the colubrine snakes in the collection of the British Museum. Trustees of British Museum, London, 281 pp.
Günther, A. (1868) Sixth account of new species of snakes in the collection of the British Museum. Annals Magazine of Natural History, 4, 413–429.
Hoogmoed, M.S. (1980) Revision of the genus Atractus in Surinam, with the resurrection of two species (Colubridae, Reptilia). Zoologische Verhandelingen, 175, 1–47.
Hoogmoed, M.S. (1982) Nomenclatural problems relating to Atractus trilineatus Wagler, 1828. Zoologische Mededelingen, 56, 131–138.
Hoogmoed, M.S. & Prudente A.L.C. (2003) A new species of Atractus (Reptilia: Ophidia: Colubridae: Dipsadinae) from the Amazon forest region in Brazil. Zoologische Mededelingen, 77, 425–440.
Jan, G. (1862) Enumerazione sistematica delle specie d’ofidi del gruppo Calamaridae. Archivio per la Zoologia, l'Anatomia e la Fisiologia, 2, 1–76.
Jorge da Silva Jr., N. (1993) The snakes from Samuel hydroelectric power plant and vicinity, Rondônia, Brazil. Herpetological Natural History, 1, 37–86.
Jorge da Silva Jr., N., Silva, H.L.R., Ribeiro, R.S., Souza, I. & Souza, C.D.A. (2005) Uma nova espécie do gênero Atractus Wagler, 1928 (Colubridae: Dipsadinae) do cerrado do Brasil Central. Papéis Avulsos de Zoologia, 45, 33–39.
Kok, P.J.R. (2005) A New Genus and Species of Gymnophthalmid Lizard (Squamata: Gymnophthalmidae) from Kaieteur National Park, Guyana. Bulletin de l’Institut Royal des Sciences naturelles de Belgique, Biologie, 75, 35–45.
Kok, P.J.R., Sambhu, H., Roopsind, I., Lenglet, G.L. & Bourne, G.R. (2006) A new species of Colostethus (Anura: Dendrobatidae) with maternal care from Kaieteur National Park, Guyana. Zootaxa, 1238, 35–61.
Lancini, A.R. (1986) Serpientes de Venezuela. Ernesto Armitano Ed., Caracas, 262 pp.
Leviton, A.E., Gibbs, Jr., R.H., Heal, E. & Dawson, C.E. (1985) Standards in herpetology and ichthyology: Part 1. Standard symbolic codes for institutional resource collections in herpetology and ichthyology. Copeia, 1985, 802–832.
MacCulloch, R.D. & Lathrop, A. (2001) A new species of Arthrosaura (Sauria: Teiidae) from the Highlands of Guyana. Caribbean Journal of Science, 37, 174–181.
MacCulloch, R.D. & Lathrop, A. (2002) Exceptional diversity of Stefania (Anura: Hylidae) on Mount Ayanganna, Guyana: three new species and new distribution records. Herpetologica, 58, 327–346.
MacCulloch, R.D. & Lathrop, A. (2004) A new species of Dipsas (Squamata: Colubridae) from Guyana. Revista de Biología Tropical, 52, 239–247.
MacCulloch, R.D. & Lathrop, A. (2005) Hylid frogs from Mount Ayanganna, Guyana: new species, redescriptions, and distributional records. Phyllomedusa, 4, 17–37.
Martins, M. & Oliveira, M.E. (1993) The snakes of the genus Atractus Wagler (Reptilia: Squamata: Colubridae) from the Manaus region, central Amazonia, Brazil. Zoologische Mededelingen, 67, 21–40.
Martins, M. & Oliveira, M.E. ("1998") [1999] Natural history of snakes in forests in the Manaus region, Central Amazonia, Brazil. Herpetological Natural History, 6, 78–150.
Murphy, J.C. (1997) Amphibians and Reptiles of Trinidad and Tobago. Krieger Publishing Company, Malabar, Florida, 245 pp.
Myers, C.W. (2003) Rare snakes — Five new species from eastern Panama: reviews of northern Atractus and southern Geophis (Colubridae: Dipsadinae). American Museum Novitates, 3391, 1–47.
Myers, C.W. & Campbell, J.A. (1981) A new genus and species of colubrid snake from the Sierra Madre del Sur of Guerrero, Mexico. American Museum Novitates, 2708, 1–20.
Noonan, B.P. & Harvey, M.B. (2000) A new species of glass frog (Anura: Centrolenidae) from the Highlands of Guyana. Herpetologica, 56, 294–302.
Noonan, B.P. & Bonett, R.M. (2003) A new species of Hyalinobatrachium (Anura: Centrolenidae) from the Highlands of Guyana. Journal of Herpetology, 37, 91–97.
Peters, J.A. & Orejas-Miranda, B. (1970) Part I: Snakes. In: Catalogue of the Neotropical Squamata. Smithsonian Institution Press, Washington D.C., 347 pp.
Passos, P., Fernandes, R. & Zanella, N. (2005) A new species of Atractus (Serpentes: Colubridae) from southern Brazil. Herpetologica, 61, 209–218.
Prado, A. (1940a) Notas ofiológicas 5: observações sobre as serpentes da Colômbia. Memórias do Instituto Butantan, 14, 1–11.
Prado, A. (1940b) Notas ofiológicas 8: dois novos Atractus da Colômbia. Memórias do Instituto Butantan, 14, 25–30.
Roze, J.A. (1961) El género Atractus (Serpentes: Colubridae) en Venezuela. Acta Biológica Venezuelica, 3, 103–119.
Savage, J.M. (1960) A revision of the ecuadorian snakes of the colubrid genus Atractus. Miscellaneous Publications Museum of Zoology, 112, 5–86.
Schargel, W.E. & Castoe, T.A. (2003) The hemipenes of some snakes of the semifossorial genus Atractus, with comments on variation in the genus. Journal of Herpetology, 37, 718–721.
Schargel, W.E. & García-Pérez, J.E. (2002) A new species and a new record of Atractus (Serpentes: Colubridae) from the Andes of Venezuela. Journal of Herpetology, 36, 398–402.
Silva Haad, J.J. (2004) Las serpientes del género Atractus Wagler, 1828 (Colubridae, Xenodontinae) en la Amazonia Colombiana. Revista de la Academia Colombiana de Ciencias Exactas, Físicas y Naturales, 28, 409–446.
Smith, E.N. & Noonan, B.P. (2001) A new species of Osteocephalus (Anura: Hylidae) from Guyana. Revista de Biología Tropical, 49, 347–357.
ter Steege, H. (2001) National Vegetation map of Guyana, Guyana Forestry Commission: Georgetown.
Wagler, J.G. (1828) Auzüge aus seinem Systema Aphibiorem. Isis von Oken, 21, 740–744.
Zaher, H. & Prudente, A.L.C. (2003) Hemipenis of Siphlophis (Serpentes: Xenodontinae) and techniques of hemipenial preparation in snakes: A response to Dowling. Herpetological Review, 34, 302–307.