Tick

Ixodidae - Hard ticks
Argasidae - Soft ticks
Nuttalliellidae - ????? ticks

Tick is the common name for the small arachnids that, along with other mites, constitute the order Acarina. Ticks are ectoparasites (external parasites), living by hematophagy on the blood of mammals, birds, and occasionally reptiles and amphibians. Ticks are important vectors of a number of diseases, including Lyme disease.