Attagenus (Aethriostoma) undulatus, commonly known as the Dermestid beetle, is a species of skin beetle found in Comoros, Madagascar, Mauritius, Seychelles, Buru Island, Cambodia, southern China, India, Indonesia, Laos, Malaysia, Myanmar, Philippines, Sri Lanka, Thailand, Vietnam, Hawaiian Islands, Papua New Guinea, and South Mariana Islands. It has introduced to Chile mainly through goods of human beings.

Body length is about 3 mm.

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