Psoroptidia

{{Short description|Group of mites}}

{{Automatic taxobox

| image = Psoroptes cuniculi.JPG

| image_alt = "Psoroptes cuniculi" (Sarcoptoidea: Psoroptidae)

| image_caption = Psoroptes cuniculi (Sarcoptoidea: Psoroptidae)

| taxon = Psoroptidia

| authority = Yunker, 1955

| synonyms =

| synonyms_ref =

| subdivision_ranks = Superfamilies

| subdivision =

• Analgoidea (feather mites)
• Pterolichoidea (feather mites)
• Sarcoptoidea
• Psoroptidia incertae sedis
• Heteropsoridae

}}

Psoroptidia is a parvorder of the Acari (mite) group Astigma (or Astigmatina).{{cite web |title=Psoroptidae |url=https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Tree&id=83910&lvl=3&keep=1&srchmode=1&unlock| website=NCBI taxonomy |publisher=National Center for Biotechnology Information |location=Bethesda, MD |access-date=31 May 2019}} It comprises around 40 families, and apparently originated as parasites of birds, before a secondary radiation saw some taxa become parasites of mammals.{{cite book |editor=Marilyn A. Houck |year=1994 |title=Mites: Ecological and Evolutionary Analyses of Life-history Patterns |publisher=Springer |isbn=978-0-412-02991-2 |author=Barry M. OConnor |authorlink = Barry OConnor|chapter=Life-history modifications in astigmatid mites |pages=136–159 |chapter-url=https://books.google.com/books?id=VATkrjHFxM8C&pg=PA154}} Because of their parasitic lifestyle, members of the Psoroptidia do not exhibit a deutonymph stage.{{cite book |author=Matthew J. Colloff |year=2009 |title=Dust Mites |publisher=Springer |isbn=978-90-481-2223-3 |chapter=Identification and taxonomy, classification and phylogeny |pages=1–44 |chapter-url=https://books.google.com/books?id=lakY0ZrfMGMC&pg=PA17}}

The group contains many of the more notorious parasitic members of the Astigmata. Three of the superfamilies in this clade are among those Acarina collectively called feather mites, whereas the fourth and fifth – Psoroptoidea and Pyroglyphoidea – contains ear mites and scabies mites among others.