Symmela opaca is a species of beetle of the family Scarabaeidae. It is found in Brazil (Goiás).
Adults reach a length of about 5.1 mm. The head is black, dull and shiny, with erect, sparse setae. The pronotum is black and dull but iridescent. The elytra are blackish brown with a light humeral spot. The surface is opaque and without setae.