dorsal-ventrally flat flattened from top and bottom
Syllidae	Palmyridae
Aphroditidae	Spionidae
Pilargiidae	Hesionidae
Phyllodocidae

cylindrical long with flat ends
Cirratulidae	Eunicidae
Glyceridae	Sternapsidae

fusiform rounded and tapering from middle towards end

Opheliidae

Opheliidae

tapered narrowing towards the end

Terebellidae

trumpetshaped broad and narrow at opposite ends

Pectinariidae

elongated long and thin

Trichobranchidae

vermiform wavy

Lacydoniidae

oval egg or ecllipse shaped

Sigalionidae