Thoasia pterosmaragdos, the emerald-winged pentagonal arboreal carabid, is a species of beetle in the family Carabidae. It is found in French Guiana.
They are macropterous and capable of flight. Standard body length is 4.21âÂÂ4.39 mm. Elytra entirely metallic dark emerald shiny. Pronotum moderately narrow. Abdomen Sparsely setiferous.