Morphological extremes--two new snakes of the genus Atractus from northwestern South America (Colubridae, Dipsadinae) ; American Museum novitates, no. 3532

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dc.contributor.authorMyers, Charles W.en_US
dc.contributor.authorSchargel, Walter E.en_US
dc.date.accessioned2006-09-18T16:17:43Z
dc.date.available2006-09-18T16:17:43Z
dc.date.issued2006en_US
dc.description13 p. : ill., map ; 26 cm.en_US
dc.descriptionIncludes bibliographical references (p. 13).en_US
dc.description.abstractTwo new Andean snakes exhibit extreme morphology in a genus of South American dipsadine colubrids. One, Atractus attenuatus, new species, is a slender, exceptionally attenuated snake 420 mm in total length (adult male holotype), with 17 scale rows, a high ventral + subcaudal count (226), and an extremely vague pattern of numerous, closely spaced, indistinct dark crossbars on a brown ground color. Atractus attenuatus comes from 1000 m elevation in the northern end of the Cordillera Central (Sabanalarga, Antioquia, Colombia). A geographic neighbor, Atractus sanguineus Prado, is of similar morphology but differs in having distinct, widely spaced crossbars on a red ground color. At another extreme, Atractus gigas, new species, is a very robust snake that exceeds a meter in length (adult female holotype 1040 mm in total length), with a hint of pale transverse dorsal bars on a brown ground color. It is the largest known Atractus, differing in color pattern and details of scutellation from the several other congeners that attain lengths > 700 mm. The only known specimen has an azygous frontonasal scale that is atypical of colubrids (but is not an obvious aberrancy). Atractus gigas comes from 1900 m elevation on the Pacific versant of the Andes (Bosque Protector RĂ¢io Guajalito, Pichincha, Ecuador.en_US
dc.format.extent2988395 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/2246/5810
dc.languageengen_US
dc.language.isoen_US
dc.publisherNew York, NY : American Museum of Natural Historyen_US
dc.relation.ispartofseriesAmerican Museum novitates, no. 3532en_US
dc.subject.lccQL1 .A436 no.3532 2006en_US
dc.subject.lcshAtractus attenuatusen_US
dc.subject.lcshAtractus gigasen_US
dc.subject.lcshAtractusen_US
dc.subject.lcshAtractus -- Morphology.en_US
dc.subject.lcshSnakes -- Colombia -- Antioquia (Dept.)en_US
dc.subject.lcshSnakes -- Ecuador -- Pichincha (Province)en_US
dc.subject.lcshSnakes -- Andes Regionen_US
dc.subject.lcshReptiles -- Colombia -- Antioquia (Dept.)en_US
dc.subject.lcshReptiles -- Ecuador -- Pichincha (Province)en_US
dc.subject.lcshReptiles -- Andes Regionen_US
dc.titleMorphological extremes--two new snakes of the genus Atractus from northwestern South America (Colubridae, Dipsadinae) ; American Museum novitates, no. 3532en_US
dc.title.alternativeMorphological extremes, two new snakes of the genus Atractus from northwestern South America (Colubridae, Dipsadinae)en_US
dc.title.alternativeTwo new snakes of the genus Atractus from northwestern South America (Colubridae, Dipsadinae)en_US
dc.title.alternativeNew snakesen_US
dc.typetexten_US

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