Three new subgenera of the genus Unionicola Haldeman, 1842 (Acari, Hydrachnidia, Unionicolidae) from China

Five species of Unionicola Haldeman, 1842 (Acari: Hydrachnidia: Unionicolidae) were collected between 2018 and 2019. Notably, Unionicola (Armatax) armata Walter, 1929, previously unrecorded in China, is now documented for the first time in the country. Additionally, Unionicola newsumi Wiles, 1999 has been reclassified and assigned to the new subgenus Vespicola within the genus Unionicola Haldeman, 1842. These findings also led to the establishment of three new subgenera: Micronodus gen. nov., Vespicola gen. nov., and Lingshuiatax gen. nov. including four species: Unionicola soluplatus sp. nov. U. jini sp. nov. U. caudipes sp. nov. and U. armatalla sp. nov. This marks the first description and documentation of these subgenera and species.