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Psoroptidia is a parvorder of the Acari (mite) group Astigma (or Astigmatina). It comprises around 40 families, and apparently originated as parasitism of , before a secondary radiation saw some taxa become parasites of . Because of their parasitic lifestyle, members of the Psoroptidia do not exhibit a deutonymph stage.
The group contains many of the more notorious parasitism members of the Astigmata. Three of the superfamilies in this clade are among those Acarina collectively called , whereas the fourth and fifth – Psoroptoidea and Pyroglyphoidea – contains and scabies mites among others.
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