Abstract
Analysis of variation in the South American tegu lizards, genus Tupinambis requires revision of their systematics. Two species are recognized: T. teguixin and T. rufescens. Tupinambis nigropunctatus Spix, 1825, is placed in the synonymy of T. teguixin (Linnaeus, 1758). The nominal taxa T. duseni Lonnberg and Andersson 1910, and T. teguixin sebastiani Miiller, 1968, are placed in the synonymy of T. rufescens (Guinther, 1871). Tupinambis teguixin is restricted to the tropical and subtropical vegetational communities of Colombia, Venezuela and the Guyanas and it occurs throughout the Amazon basin, following these associations south along the major river systems to Rosario, Argentina. Tupinambis rufescens is restricted to arid and semiarid associations of eastern and southeastern Brazil, Bolivia, south through Paraguay to Buenos Aires, Argentina and Durazno, Uruguay. Sympatry is indicated by records for both species from Ascunci6n and from other localities along the Rios Apa and Pilcomayo in Paraguay and from the province of Santa Fe, Argentina.
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