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A New Species of Tupinambis (Squamata: Teiidae) from Central Brazil, with an Analysis of Morphological and Genetic Variation in the Genus

Guarino R. Colli, Ayrton K. Péres, Jr. and Hélio J. da Cunha
Herpetologica
Vol. 54, No. 4 (Dec., 1998), pp. 477-492
Published by: Allen Press on behalf of the Herpetologists' League
Stable URL: http://www.jstor.org/stable/3893442
Page Count: 16
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A New Species of Tupinambis (Squamata: Teiidae) from Central Brazil, with an Analysis of Morphological and Genetic Variation in the Genus
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Abstract

We describe a new species of Tupinambis from central Brazil. Tupinambis cerradensis is apparently endemic to the Cerrado biome and associated with gallery forests. Tupinambis cerradensis is sympatric with T. merianae, and probably with T. rufescens, throughout its range. A discriminant analysis of eight size-independent morphometric variables and body size indicated that relative limb size is the most striking difference among the species of Tupinambis, and that the discriminatory power of morphometric characters is low. A discriminant analysis of 10 meristic characters indicated that the number of femoral pores, dorsals, and scales around midbody are the best discriminators among the species of Tupinambis, and that the discriminatory power of meristic characters is high. Allelic frequencies from six variable presumed electrophoretic loci produced greater genetic distances between T. cerradensis and T. merianae than between T. cerradensis and T. teguixin. Tupinambis cerradensis feeds mostly on arthropods and molluscs, ingesting much less plant material and vertebrates than the larger species of the genus. /// Nós descrevemos uma nova espécie de Tupinambis do Brasil central. Tupinambis cerradensis é aparentemente endêmica do bioma do Cerrado e associada a matas de galeria. Tupinambis cerradensis é simpátrica com T. merianae e, provavelmente, com T. rufescens em sua área de ocorrência. Uma análise discriminante de oito variáveis morfométricas (independentes do tamanho) e do tamanho corporal indicou que o tamanho relativo dos membros é a diferença mais marcante entre as espécies de Tupinambis e que o poder discriminatório das variáveis morfométricas é baixo. Uma análise discriminante de dez caracteres merísticos indicou que o número de poros femorais, dorsais e escamas ao redor do meio do corpo são os melhores discriminadores entre as espécies de Tupinambis e que o poder discriminatório de caracteres merísticos é alto. Frequências alélicas de seis locos eletroforéticos variáveis produziram maiores distâncias genéticas entre T. cerradensis e T. merianae, do que entre T. cerradensis e T. teguixin. Tupinambis cerradensis se alimenta principalmente de artrópodos e moluscos, ingerindo muito menos material vegetal e vertebrados que as espécies maiores do gênero.

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