Phylum

Definition

A primary taxonomic category that ranks above class and below kingdom, grouping together organisms that share a common structural and developmental origin.

Etymology

From the Greek 'phylon', meaning 'race' or 'tribe'.

Example

Arthropoda is a phylum that includes insects, arachnids, and crustaceans.

Related Terms

• Class
• Kingdom
• Order
• Taxonomy

Usage Notes

In the classification hierarchy, a phylum is a broad group that houses organisms which have significant morphological or developmental similarities.