The taxon "Acari" is an informal category to cover the six orders of arachnids recognised in the AFD (see https://biodiversity.org.au/afd/taxa/Acari) which are called mites and ticks, but which may or may not be related.
Further reference: https://en.wikipedia.org/wiki/Acari
Acari (informal subclass) is listed in the following regions:
Canberra & Southern Tablelands | Southern Highlands | South Coast | Greater Brisbane
Maps
ANBG Aranda Bushland Bango Nature Reserve Black Mountain Bluetts Block (402, 403, 12, 11) Bruce Ridge Bruce Ridge to Gossan Hill Budjan Galindji (Franklin Grassland) Reserve Bungonia National Park Campbell Park Woodland Cuumbeun Nature Reserve Deua National Park (CNM area) Dryandra St Woodland Flea Bog Flat, Bruce Goorooyarroo NR (ACT) Goulburn Mulwaree Council Griffith Woodland Higgins Woodland Jerrabomberra Wetlands Kosciuszko National Park Lake Burley Griffin Central/East Mongarlowe River Mount Ainslie Mount Painter Namadgi National Park Piney Ridge Red Hill Nature Reserve Sth Tablelands Ecosystem Park Sullivans Creek, Turner Tidbinbilla Nature Reserve West Goulburn Bushland ReservePlaces
Ainslie, ACT Aranda, ACT Bungonia, NSW Carwoola, NSW Casey, ACT Charleys Forest, NSW Holder, ACT Melba, ACT Nicholls, ACT Parkes, ACT Pialligo, ACT Yarralumla, ACT