Number of nymphal stages is Acarina is

Number of nymphal stages is Acarina is 3.
The order Acarina, including mites and ticks, contains numerous economically and medically important species that are parasitic on humans, domesticated or hunted animals, and crops, food, etc.
The Ixodidae may have only one nymphal stage, while the Argasidae may have as many as eight. Some Prostigmata develops directly from egg to larviform adults, while others have from one to three nymphal stages.