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
Arachnid	† Canadaspis	Crustacean
Entognatha	Insect	† Marrella
Myriapoda	†Naraoia	†Sea scorpions
Sea spider	†Trilobite	Xiphosura