Palaeorhiza mandibularis, or Palaeorhiza (Anchirhiza) mandibularis, is a species of bee in the family Colletidae and subfamily Hylaeinae. It is native to Meganesia. It was described by American entomologist Charles Duncan Michener in 1965.
Distribution and habitat The species occurs in New Guinea and eastern Australia. The type locality is Beaudesert, Queensland. It has also been recorded from Mount Kaindi near Wau, Papua New Guinea.
Behaviour The adults are flying mellivores. Flowering plants visited by the bees include Euodia species.
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