Leioproctus nanus, or Leioproctus (Leioproctus) nanus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by English entomologist Frederick Smith in 1879.
Distribution and habitat The species occurs in Western Australia. The exact locality where the holotype was collected is unknown. A syntype is from Yallingup.
Behaviour The adults are flying mellivores.
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