body wall

From ZooTerms (Dictionary of Invertebrate Zoology)
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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.