Achaea trapezoides is a species of moth of the family Erebidae. It is found in South Africa and on Réunion.
Achille Guenée described this species with a wingspan of 52 mm.A. Guenée in: Maillard, 1862, Notes sur l'Ile de la Réunion, Annexe G, page 47
Their caterpillars feed on Euphorbiaceae, Acalpha species and Ricinus communis. They have also been observed on rosesLes papillons de La Réunion et leurs chenilles. - page 398
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