Arhesiro sonoma is a species of mite harvestman in the family Sironidae (as of 2023). It is found in North America, specifically USA, California, Sonoma County.
The genus Arhesiro was described by Karaman, 2022, with the type species Siro clousi Giribet & Shear, 2010. Before then, both this species and that other were previously placed in Siro.