Arachnids are a major class of this phylum that includes insects & crustaceans
... One of the major arthropod groups is represented here by Polistes .... Insects 
and other arthropods (phylum Arthropoda) have a coelom, segmented bodies... [DOC] [TLE] The Trilobites, Crabs, Insects, Spiders and their Allies (Phylum ... [PAR] An introduction to the biology, classification and ecology of Insects, Spiders and 
Allies the phylum Arthropoda.