Includes Insects, Crustea (shrimp,crab), and Arachnida(Spiders)

Characteristics:

-Jointed appendages

-Segmented into head, throax, abdomen

-More sensory apparatus than in annelids, giving them more speed and freedom of movement

-Chitinous exoskeleton protects the animal

-Open circulatory System with a tubular heart

-Air ducts called trachea bring air from the environment