Oxychalepus posticatus is a species of beetle of the family Chrysomelidae. It is found in Brazil, Costa Rica, Nicaragua and Panama.
Description Adults reach a length of about 10–11.6 mm. They have black antennae and legs. The head is also black, but with an orangish spot. The pronotum is orangish with a black medial vitta and the elytron is orangish with basal black sutural vitta. The apical one-fourth is also black.
Biology They have been recorded feeding on Cassia oxyphylla, Cassia hayesiana and Cassia fruticosa.
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