Batrisus formicarius

Batrisus formicarius is a European species of ant-loving beetle placed within the Pselaphinae subfamily of the Staphylinidae family. Biology and distribution Batrisus formicarius is a myrmecophile: it lives in association with ants, being found inside nests of the ant Lasius brunneus as well as, occasionally, Lasius emarginatus. The small, ant-sized beetle acts as a commensal organism, feeding on the mites which are often found inhabiting the ants' nests.

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