Diomus triangularis is a species of beetle of the family Coccinellidae. It is found in Australia (New South Wales, South Australia).
Description Adults reach a length of about . The head, antennae, legs, most of the pronotum and lateral parts of the elytra are yellowish brown, while the central part of the pronotum and a large triangular marking on the elytra are dark brown. The dorsal surface is shiny and has short setae.
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