Leioproctus flavimandibulatus, or Leioproctus (Euryglossidia) flavimandibulatus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by entomologist Michael Batley in 2025.
Etymology The specific epithet flavimandibulatus is an anatomical reference to the yellow mandible of the female.
Description The male body length is about 5.5 mm, female body length 6 mm. Integumental colouration is mainly black with the metasoma red-brown. The hair is white and brown.
Distribution and habitat The species occurs in south-west Western Australia. The type locality is Mount Gibson at the northern edge of the Wheatbelt.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Calycopeplus paucifolius as well as Grevillea species.
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