Suborder

[Sarah]

A division of an order; a group of genera of a little lowerrank than an order and of greater importance than a tribe or family;as, cichoraceous plants form a suborder of Compositæ.

[Tariq Zaki]

(used in the classification of plants and animals) a group of related plants or animals, more closely related than an order but less similar than a family

[Jessica]

A taxonomic category that ranks below order and above family.