Annelida

noun plural

An·​nel·​i·​da ə-ˈnel-ə-də, a- 

: a phylum of coelomate and usually elongated segmented invertebrates (as earthworms, various marine worms, and leeches)

annelid

ˈan-ᵊl-əd 

noun or adjective

annelidan

ə-ˈnel-əd-ən, a- 

adjective or noun