Fagacarus

Superregnum: Eukaryota
Cladus: Unikonta
Cladus: Opisthokonta
Cladus: Holozoa
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Protostomia
Cladus: Ecdysozoa
Cladus: Panarthropoda
Phylum: Arthropoda
Subphylum: Chelicerata
Classis: Arachnida
Subclassis: Acari
Superordo: Acariformes
Ordo: Oribatida
Infraordo: Desmonomata
Cohort: Astigmata
Subordo: Acaridia
Superfamilia: Acaroidea

Familia: Acaridae
Subfamilia: Fagacarinae
Genus: Fagacarus
References

Klimov, P.B. 2000: Notes on systematics, distribution and ecology of mites of the genus Fagacarus (Acariformes: Acaridae). Acarina, 8(2): 105–115. PDF

Fagacarus is a genus of mites in the family Acaridae. It contains a single described species, and at least two undescribed species.[2] Fagacarus species feed on fungi in decaying wood.[2]
References

Fain, A.; Norton, R.A. (1979). "Fagacarus verrucosus n.g., n.sp. (Acari, Astigmata) from decaying beech wood in the U.S.A.". International Journal of Acarology. 5: 5–8. doi:10.1080/01647957908683160.
Klimov, P. B. (2000). "Notes on systematics, distribution and ecology of mites of the genus Fagacarus (Acariformes, Acaridae)" (PDF). Acarina. 8 (2): 105–115.