oostegite

from The Century Dictionary.

• noun An egg-covering or case for ova, formed in certain crustaceans, as amphipods and isopods, by a laminar expansion of the limbs of certain somites of the body. See Amphipoda, Isopoda, and cuts under Amphipoda and Amphilhoë.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) One of the plates which in some Crustacea inclose a cavity wherein the eggs are hatched.