Scymnobius triangularis is a species of beetle of the family Coccinellidae. It is found in Chile.
Description Adults reach a length of about 1.5–1.8 mm. Adults are brownish yellow, while the median one-third of the pronotum is brown to dark brown. The basal one-fourth of the elytron is brown and there is a dark brown spot.
Etymology The species name refers to the triangular form of the basal lobe in the male genitalia.
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