Revisão taxonômica de Drymoluber Amaral, 1930 (Serpentes, Colubridae)

• Autor(a) principal: Costa, Henrique Caldeira
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: LOCUS Repositório Institucional da UFV
• Texto Completo: http://locus.ufv.br/handle/123456789/2241
• topic: Taxonomia; Drymoluber; Serpentes; Zoologia; América do Sul; Taxonomy; Drymoluber; Snakes; Zoology; South America; CNPQ::CIENCIAS BIOLOGICAS::ZOOLOGIA

Drymoluber Amaral, 1930 presents three snake species from South America east of the Andes. The present study makes a taxonomic revision of the genus, through the comparison of meristic and morphometric characters, aspects of external hemipenial morphology and body coloration of specimens of D. apurimacensis, D. brazili and D. dichrous from museum collections. The following statistical analyses were perfomed: analyses of univariate and multivariate variance (to evaluate the presence of sexual dimorphism in the three species); principal components analyses (to evaluate morphological variation); correlation between matrices of dissimilarity and geographic distance (to evaluate relationship between geographic distance and variation in scutellation characters); linear correlation (to evaluate the presence of clinal variation in number of ventral and subcaudal scales). Sexual dimorphism occurs in D. dichrous and D. brazili and was not detected in D. apurimacensis. The three species currently recognized in Drymoluber are distinct from each other, and do not present morphological variations that could suggest the occurrence of unidentified taxa among their populations. Morphological variation within D. dichrous is related with geographic distance between populations. Furthermore, variation in number of ventral and subcaudal scales in D. dichrous and D. brazili followed latitudinal and longitudinal clinal patterns. Drymoluber dichrous is diagnosed by the presence of 15-15-15 smoth dorsal scale rows with two apical pits, 157-180 ventrals and 86-110 subcaudals, occurring at the eastern region of the Andes, the Amazon rainforest, Guiana Shield, Atlantic rainforest and transitional areas between it and the morphoclimatical domains of Caatinga and Cerrado. Drymoluber brazili has 17-17-15 smoth dorsal scale rows with two apical pits, 182-202 ventrals and 109-127 subcaudals, ranging throughout the Caatinga, Cerrado, Atlantic rainforest, and transitional areas between these last two ecoregions. Drymoluber apurimacensis has 13-13-13 smoth dorsal scale rows lacking apical pits, 158-182 ventrals and 84-91 subcaudals, being limited to the south of the Apurimac and Pampas rivers, in Peru.