Leioproctus microsomus, or Leioproctus (Minycolletes) microsomus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by American entomologist Charles Duncan Michener in 1965.
Etymology The specific epithet microsomus refers to the small body size.
Description The female holotype body length is nearly 7 mm, wing length 4.5 mm; male allotype body length 5.5 mm, wing length 4.3 mm. Integumental colouration is mainly black, with some red and brown; the hair is dull white to grey-brown.
Distribution and habitat The species occurs in eastern Australia. The type locality is 27 km south of Dalby, in the Western Downs Region of southern Queensland.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Wahlenbergia species.
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