Alurnus orbignyi is a species of beetle of the family Chrysomelidae. It is found in Argentina, Bolivia, Brazil, Ecuador, Peru and Venezuela.
Description Adults reach a length of about 28–37 mm. Adults have a shining black head and legs, while the pronotum is reddish with a black basal spot. The elytron is pale yellow with a black spot.
Biology They have been recorded feeding on Aroides species.
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