Leioproctus opaculus, or Leioproctus (Leioproctus) opaculus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by British-American entomologist Theodore Dru Alison Cockerell in 1929.
Description Female body length is about 9 mm. Colouration is mainly black, abdomen faintly greenish, hair white to grey.
Distribution and habitat The species occurs in both eastern and western Australia. Type localities include Geraldton, Western Australia, and Charleville, Queensland.
Behaviour The adults are flying mellivores.
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