pleopodal cavity
The deeply concave ventral surface of the pleotelson that encloses the pleopods dorsally and laterally. Because the more posterior pleopods function as gills, the pleopodal family is sometimes called the branchial cavity [Wilson, 1989].

Crustacea glossary. . 2011.

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  • preanal ridge — A raised, transverse ridge on the ventral surface of the pleotelson situated between the pleopodal (or branchial) cavity and the anus. In some munnopsids, this ridge becomes very large [Wilson, 1989] …   Crustacea glossary

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