Holosiro is a genus of mite harvestman in the family Sironidae. It is found in North America, only in the USA, with one species in California, another in Oregon.
The genus Holosiro was described by Ewing, 1923, with the type species Holosiro acaroides Ewing, 1923. For several years the genus was treated as a junior subjective synonym Siro Latreille, 1797.
These species belong to the genus Holosiro:
The genus is masculine, derived from Siro