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The main goal of this manuscript is the reevaluation of the taxonomic status of the teiid lizard Contomastix charrua,known only from Cabo Polonio, a small coastal rocky outcrop in southeastern Uruguay. This species was erected on the basis of the presence of a second pair of ceratobranchials and longer cornua in the hyoid bone, in addition to a reduced expression of the pattern of coloration as compared with C. lacertoides. Nevertheless, we found that both species have indistinguishable hyoid morphology, bearing C. lacertoides a noticeable second pair of ceratobranchials. Besides, we realized that the pattern of coloration in this species is more variable than previously considered. As a result of the present work, C. charrua is included in the synonymy of C. lacertoides. In addition, we provide some observations on the holotype of Cnemidophorus grandensis, a junior synonym of C. lacertoides Fil: Borteiro, Claudio. Museo Nacional de Historia Natural; Uruguay Fil: Kolenc, Francisco. Museo Nacional de Historia Natural; Uruguay Fil: Prigioni, Carlos. Museo Nacional de Historia Natural; Uruguay Fil: Lucio Lyra, Mariana. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil Fil: Baldo, Juan Diego. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Nordeste. Instituto de Biología Subtropical. Instituto de Biología Subtropical - Nodo Posadas; Argentina |
