Annelida
A division of the Articulata, having the body formed of numerous rings or annular segments, and without jointed legs. The principal subdivisions are the Chætopoda, including the Oligochæta or earthworms and Polychæta or marine worms; and the Hirudinea or leeches. See Chætopoda.
Annelidanoun
segmented worms: earthworms; lugworms; leeches
Arthropoda
A large division of Articulata, embracing all those that have jointed legs. It includes Insects, Arachnida, Pychnogonida, and Crustacea.
Arthropodanoun
jointed-foot invertebrates: arachnids; crustaceans; insects; millipedes; centipedes