anal operculum
(Subclass Copepoda):
A small median process on dorsal surface of the anal somite protecting the anus [Boxshall and Halsey, 2004].
(Subclass Copepoda):
Lid-like structure covering anus. (smooth, toothed) [Stachowitsch, 1992].

Crustacea glossary. . 2011.

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