Parasitiformes

The superorder Parasitiformes is a group within the arachnid subclass Acari, which also includes mites and ticks. Members of Parasitiformes are typically characterized by having a hardened body and sensory organs on their first pair of legs. This superorder encompasses several orders, including Mesostigmata, Holothyrida, Ixodida (ticks), and Opilioacarida.12

Parasitiformes are diverse in size and structure, with some species being microscopic while others, like ticks, can reach over 30 mm in length. They are found in nearly every habitat worldwide, from high altitudes to deep oceans. Many species are free-living, but some are parasitic, feeding on animals and sometimes transmitting diseases to humans and other animals. For instance, ticks (Ixodida) are significant vectors of diseases such as Lyme disease and Rocky Mountain spotted fever. Mites within this superorder can also be important parasites or play roles in soil ecosystems.13