Intertaxon relationships
Aculus hippocastani (Fockeu, 1890)
[1]
Phloeophagus lignarius (Marsham, 1802) 
Phloeophagus thomsoni (Grill, 1898)
Links and literature
[1] Máca J. (2017): Neglected Eriophyoid Mites with Conspicuous Galls: Concealed Biodiversity, Živa 3/2017, 133 [as Aesculus]
Máca J. (2017): Neglected Eriophyoid Mites with Conspicuous Galls: Concealed Biodiversity, Živa 3/2017, 133 [as Aesculus]