Glossary & References / Keywords List / Definitions:

Term to be defined Definition Synonyms & Keywords
Arthropod - "an organism with a segmented body, external skeleton, and jointed limbs, which is considered to belong to a group of animals known as the Arthropoda.

Although this group is currently considered by most taxonomists to consist of a number of different phyla (Chelicerata - Chelicerates, Crustacea - Crustaceans and Pentastomes, Mandibulata - Uniramia), other taxonomists consider this group of organisms to be one single phyla (Arthropoda)." (V.w6)