Euhesma aulaca, or Euhesma (Euhesma) aulaca, is a species of bee in the family Colletidae and the subfamily Euryglossinae. It is endemic to Australia. It was described in 2015 by entomologists Katja Hogendoorn and Remko Leijs.
Etymology The specific epithet aulaca (‘furrowed’) refers to a distinctive deep median furrow in the clypeus.
Description The female holotype has a body length of 5.5 mm, wing length 3.5 mm, and head width 1.6 mm. A male paratype has a body length of 5.2 mm, wing length 3.6 mm, and head width 1.2 mm. Colouration is mainly black, brown and yellow.
Distribution and habitat The species occurs in South Australia. The type locality is Bon Bon Reserve.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Eremophila scoparia.
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