body wall
From ZooTerms (Dictionary of Invertebrate Zoology)
body wall: 1. The integument, the outer layer of many invertebrates, comprising the epidermis (hypodermis) and the cuticle.
2. (Bryozoa) The wall enclosing the body cavity of a colony and its parts.
3. (Echiura) The dermal, glandular, muscular and epithelial tissues that make up the wall of the trunk.
