Leioproctus calvus, or Leioproctus (Euryglossidia) calvus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by entomologist Michael Batley in 2025.
Etymology The specific epithet calvus (Latin: "bald") refers to the relative hairlessness of the sternal plates on the metasoma.
Description The male body length is 7.5 mm. Integumental colouration is mainly black with a brassy sheen, and brown. The hair is mostly white.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is Cranmore Park, near Bindi Bindi, in the Wheatbelt region.
Behaviour The adults are flying mellivores.
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