(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. Natural History Museum of Los Angeles County. 2011.