Arthropoda

An arthropod is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and jointed appendages. For more information, visit the Wikipedia entry Go back to Animalia
Arachnids	†Canadaspis	Crustaceans
Springtails & relatives	Insects	† Marrella
Myriapods	†Naraoia	†Sea scorpions
Sea spiders	†Trilobites	Horseshoe crabs & relatives