Arthropods

**Definition:** Members of the phylum Arthropoda, composed of organisms having a hard, jointed exoskeleton and paired jointed legs. It includes the class INSECTS and the subclass ARACHNIDA, many species of which are important medically as parasites or as vectors of organisms capable of causing disease in man.

**Tree numbers:** - B01.050.500.131

**Synonyms:** - Arthropoda