Class Arachnida Lamarck, 1801
Count: [o†o] 17o; †3o
   Subclass Acari Leach, 1817 - mites and ticks
  Count: [o] 7o
     1 Superorder Parasitiformes Reuter, 1909 - ticks and ticklike mites
    Count: [o] 4o
     2 Superorder Acariformes Zakhvatkin, 1952 - mitelike mites
    Count: [o] 3o