Phylum: Echiura

Species/group: Marine, and there are 135 known species.

Distinguishing features:
Long,retractable anterior end.

General habitat: Bentic,
Western coast of North America.

Phylum: Ecoprocta

Species/group: Almost all groups are marine, 4,500 species.

Distinguishing features: lophophore, and colonial.

General habitat: Bentic, fresh and saltwater.