Diomus prodigialis is a species of beetle of the family Coccinellidae. It is found in Australia (South Australia).
Description Adults reach a length of about . The body is dark brown to black with the head, anterior corners of the pronotum, antennae and legs yellowish. The dorsal surface is glabrous and shiny.
Etymology The species name is derived from Latin prodigialis (meaning strange) and refers to its apparently glabrous, shiny body and unusual shape of a tegmen in the male genitalia.
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