Eunicida

Eunicida Temporal range: Ordovician–recent PreЄ Є O S D C P T J K Pg N
Eunice aphroditois
Scientific classification
Kingdom:	Animalia
Phylum:	Annelida
Class:	Polychaeta
Subclass:	Aciculata
Order:	Eunicida
Families
See text

Eunicida is an order of polychaete worms.

Members of this order have an elongated, segmented body and a distinct head, normally with a separate peristomium and prostomium. Many, but not all, live in tubes which vary from a mucous sheath to a tough, horny casing. The palps vary from globular to cylindrical and there are from 0 to 7 antennae, usually smooth but occasionally jointed. There is a muscular pharynx with a dorsal pair of mandibles and a set of ventral, toothed, maxillary plates. Some species have tentacular cirri and all have unbranched parrapodia. In some species dorsal cirri, branchiae, ventral cirri and chaetae occur, but not in others.

The World Register of Marine Species includes the following families in the order: