Leioproctus aberrans, or Leioproctus (Colletellus) aberrans, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by entomologist Remko Leijs in 2018.
Etymology The specific epithet aberrans refers to abnormal wing venation.
Description The holotype female body length is 6.2 mm, head width 2 mm, The allotype male body length is 5.2 mm, head width 1.8 mm. Integumental colouration is mainly black with orange-brown markings.
Distribution and habitat The species occurs in South Australia. The type locality is Bon Bon Station.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Angianthus brachypappus.
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