Leioproctus filamentosus, or Leioproctus (Filiglossa) filamentosus, is a species of bee in the family Colletidae and subfamily Colletinae. It is endemic to Australia. It was described by Australian entomologist Tarlton Rayment in 1959.
Description Male body length about 5.4 mm, and slender. Integumental colouration mainly black, hair white.
Distribution and habitat The species occurs in eastern Australia. The type locality is Lane Cove, Sydney.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Persoonia species.
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