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noun-plural. A large division of Articulata, embracing all those that have jointed legs. It includes Insects, Arachnida, Pychnogonida, and Crustacea.

One of two prime divisions (Anarthropoda being the other) into which a subkingdom Annulosa has been divided.

In more modern and exact usage, one of the phyla, subkingdoms, or main types of the Metazoa, containing the articulated, invertebrate, non-ciliated animals with articulated limbs, a ganglionic nervous system, oviparous reproduction, and generally separate sexes.

n. jointed-foot invertebrates: arachnids; crustaceans; insects; millipedes; centipedes

"Insects were members of the phylum arthropoda—creatures having hard outer skeletons and jointed legs."

phylum   

radiata    life-period    suborder    mollusca    vertebrata