See text Holosiro is a genus of mite harvestman in the family Sironidae.

[1][2] It is found in North America, only in the USA, with one species in California, another in Oregon.

[1][3][4][5] 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.

[6] These species belong to the genus Holosiro: The genus is masculine, derived from Siro