Leioproctus rudissimus, or Leioproctus (Odontocolletes) rudissimus, 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 Male body length is about 7.3 mm. Colouration is mainly black; the hair white to pale brown.
Distribution and habitat The species occurs in Western Australia. The type locality is Wyalkatchem in the Wheatbelt. It has also been recorded from Yuin Station in the Mid West region.
Behaviour The adults are flying mellivores.
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