Wallacea marginata is a species of beetle in the family Chrysomelidae. It is found in Indonesia (Java, Mentawai).Sekerka, L. 2015. Wallacea, Pistosia and Neodownesia: three distinct genera and their tribal placement (Coleoptera: Chrysomelidae: Cassidinae). Acta Entomologica Musei Nationalis Pragae 55(2): 713–743.
Biology They have been recorded feeding on Plectocomia species.
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