Opilioacarus is a genus of opilioacarid mites native to the Mediterranean region. The following species are recognised: Opilioacarus baeticus Moraza et al. 2022, Iberian Peninsula Opilioacarus brignolii Araújo & di Palma, 2018, Southern Italy, Sardinia Opilioacarus italicus (With, 1904) Sicily Opilioacarus segmentatus With, 1902 Greece, Algeria, Uzbekistan? (possibly in need of splitting) Opilioacarus thalerihttps://www.iucnredlist.org/species/230714701/230714703 Opilioacarus aenigmus Dunlop et al. 2004 Baltic amber, Eocene ?Opilioacarus groehni Dunlop & Bernardi, 2014 Burmese amber, Myanmar, Late Cretaceous (Cenomanian) (tentatively placed in this genus) The following species have been transferred elsewhere: Opilioacarus bajacalifornicus Vázquez & Klompen, 2002 Opilioacarus nicaraguensis Vázquez & Klompen, 2002 Opilioacarus nohbecanus Vázquez & Klompen, 2002 Opilioacarus ojastii (Lehtinen, 1980) Opilioacarus orghidani Juvara-Bals & Baltac, 1977 Opilioacarus platensis Silvestri, 1905 Opilioacarus siankaanensis Vázquez & Klompen, 2002 Opilioacarus texanus (Chamberlin & Mulaik, 1942) Opilioacarus vanderhammeni Juvara-Bals & Baltac, 1977
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