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A New Genus and Species of Colubrid Snake from the Sierra de las Minas of Guatemala

Jonathan A. Campbell and Eric N. Smith
Herpetologica
Vol. 54, No. 2 (Jun., 1998), pp. 207-220
Published by: Allen Press on behalf of the Herpetologists' League
Stable URL: http://www.jstor.org/stable/3893427
Page Count: 14
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A New Genus and Species of Colubrid Snake from the Sierra de las Minas of Guatemala
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Abstract

We describe a new genus of colubrid snake, Chapinophis, from high elevations in cloud forest of the Sierra de las Minas in east-central Guatemala. The characteristics of C. xanthocheilus, new species, include a mottled linear pattern on the body and a series of distinctive yellow markings on the lips, an anterior reduction of longitudinal dorsal scale rows, giving a formula of 15-17-17 smooth dorsal scales, a high number of ventrals (178-196), a prefrontal scale that contacts the orbit, a divided anal scute, a round pupil, a maxilla with 12-13 teeth and no diastema or enlarged rear teeth, and a bilobed, bicapitate hemipenis with a centripetal sulcus spermaticus and calyces the distal part of the organ. On one hand, the new taxon shares certain features, especially of the maxilla, with Adelphicos, Geophis, and Atractus and may be in the clade containing these snakes, Ninia, and Chersodromus. Alternatively, the hemipenial morphology of Chapinophis appears to be similar to that of several genera of snakes (Rhadinophanes and Tantalophis) known from isolated regions on the Mexican highlands west of the Isthmus of Tehuantepec, and its affinities may lie with these snakes. /// Un nuevo género de serpiente colúbrida, Chapinophis, se describe. Esta proviene de bosques nubosos altos de la Sierra de las Minas, Guatemala. Las características de C. xanthocheilus, nueva especie, incluyen un patrón corporal distintivo de líneas formadas por motas, manchas amarillas en los labios, número de hileras de escamas dorsales longitudinales reducido anteriormente, dando la formula 15-17-17, escamas lisas, alto número de escamas ventrales (178-196), escama anal dividida, pupila redonda, maxila con 12-13 dientes, sin diastema y sin dientes posteriores agrandados, hemipenes bilobados y con lóbulos capitados y caliculados en la parte distal. El nuevo taxón comparte algunas características con Adelphicos, Geophis y Atractus, y puede estar en el mismo grupo filogenético con Ninia y Chersodromus. También podría estar relacionado con los géneros Rhadinophanes, Tantalophis, o Crisantophis con quienes comparte morfología similar de las hemipenes.

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