sertanejo, by the absence of ventral longitudinal stripes, 17/17/11 dorsal scale rows, and dorsal dark brown blotches on the anterior third of the body. The new species is distinguishable from all congeners, except T. pallidus group and to accurately diagnose its fourth species from the western portion of the Amazonia lowlands. After the analysis of all species of Thamnodynastes we were able to corroborate the distinctiveness of the T. After its designation, no other paper addressed this group and its morphological variation, especially for the hemipenis, is still undetermined. sertanejo, and a fourth undescribed species. The Thamnodynastes pallidus group was briefly designated to encompass the most arboreal species of the genus, with thinner bodies and longer tails: T. The brief descriptions and lack of robust diagnostic characters are the main sources for identification errors and for the difficulty to assess the diversity estimates of the genus. The genus Thamnodynastes is the most diverse within the tribe Tachymenini, with an extensive and complex taxonomic history.
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