Arthropoda
An arthropod is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and jointed appendages.
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Arachnid | † Canadaspis | Crustacean |
Entognatha | Insect | † Marrella |
Myriapoda | †Naraoia | †Sea scorpions |
Sea spider | †Trilobite | Xiphosura |