Dimorfismo sexual e dieta de *Oxyrhopus guibei* Hoge & Romano, 1977 (Serpentes, Colubridae)

Abstract

Oxyrhopus guibei is a medium-sized, terrestrial false coral whose oviposition occurs mainly in the rainy season. Considering that studies on sexual dimorphism, morphology and diet are essential for understanding the natural history of any species, this study aimed to investigate the eating habits and reproductive biology of Oxyrhopus guibei, based on the analysis of the stomach contents and gonads of 46 specimens of this species, deposited in the Zoological Collection of the Federal University of Mato Grosso do Sul. It was possible to observe sexual dimorphism in total body size, head and snout length, as there was a significant difference between females and males. The species consumed two specimens of Cercosaura sp., one specimen of Hemidactylus mobouya, in addition to a rodent mammal and some hairs and semi-digested contents found in the analysis. Regarding reproductive biology, males mature smaller than females and the largest follicles examined belonged to females collected between November and April.