Opilioacariformes

Opilioacariformes Temporal range: Cenomanian–Recent PreЄ Є O S D C P T J K Pg N
Opilioacarus segmentatus
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Subphylum:	Chelicerata
Class:	Arachnida
Subclass:	Acari
Order:	Opilioacariformes Johnston, 1968
Family:	Opilioacaridae With, 1902
Synonyms
Notostigmata With, 1903–1904 Opilioacarida With, 1902

Opilioacariformes is the smallest order (or superorder) of mites, containing a single family, and around 10 genera. They are rare, large mites, and are widely considered primitive, as they retain six pairs of eyes, and abdominal segmentation. Opilioacariformes may be the sister group to the Parasitiformes.

The first member of the Opilioacariformes to be discovered was the Algerian species Opilioacarus segmentatus, which was described by Carl Johannes With in 1902, followed by the Sicilian Eucarus italicus and Eucarus arabicus from Aden, both in 1904. Two fossil specimens are known, one of which was discovered in Baltic amber from the Eocene, while the other one was discovered in the Burmese amber from the Late Cretaceous (Cenomanian).