We reassessed the type-series of Amphisbaena ibijara and Amphisbaena frontalis to evaluate the characters used to diagnose and distinguish them, and compared these data with additional specimens of A. ibijara. We found broadly overlapping ranges of the quantitative diagnostic characters, and no differences between the qualitative characters, that could support differences between A. frontalis and A. ibijara. Based on our morphological results, and the geographic proximity of the distribution ranges of both species, we consider A. ibijara as a junior synonym of A. frontalis. We provide updated data on intraspecific variation in the diagnostic characters of A. frontalis.

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