A revision of Discodon tricolor (Guérin-Méneville) and its mimics from the Atlantic forests of Brazil (Coleoptera: Cantharidae)

Discodon tricolor (Guérin-Méneville, 1832) was thought to be a common species widely distributed in the Atlantic Forests of Brazil, yet showing morphological and chromatic variations. After examination large number specimens from different regions Forest biome, we found that actually represents complex many similar sometimes sympatric species. Thirteen this are recognised as valid: tricolor, D. neoteutonum sp. nov., vanini obscurior Pic, 1906 stat. lineaticorne aurimaculatum marginicolle tenuecostatum nigrocephalum 1949, tamoio viridimontanum crassipes Wittmer, 1952, testaceipes 1930 nov. The albonotatum is confirmed synonym while subspecies elevated specific status. subgenus Acanthodiscodon 1952 synonymised with Gorham, 1881. All described illustrated detail an identification key provided. Despite being chromatically similar, show major differences their aedeagus antennal structures, suggesting they do not form monophyletic clade. A potential mimicry ring involving these well other members Cantharidae, Lampyridae, Cerambycidae Belidae discussed. Comments made on conservation habitats within biome.