Leioproctus cristativentris, or Leioproctus (Euryglossidia) cristativentris, 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 cristativentris (Latin: "with a tufted venter") is an anatomical reference to the ventral metasoma of the male.
Description The male body length is about 10 mm, female body length 10.8 mm. Integumental colouration is mainly black with weak blue iridescence. The hair is white and brown.
Distribution and habitat The species occurs in inland south-west Western Australia. The type locality is 70 km north-east of Wubin in the northern Wheatbelt.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Leptospermopsis erubescens.
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