An invertebrate animal of the large phylum Arthropoda, such as an insect, spider, or crustacean.
- The ecdysozoans are supposed to include arthropods, priapulids and nematodes.
- All chelicerate arthropods have this special first set of modified legs.
- The Cambrian Explosion, for example, is the first time we are able to distinguish a chordate from an arthropod.
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