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gnathostegite
From The Collaborative International Dictionary of English v.0.48:
Gnathostegite \Gna*thos"te*gite\, n. [Gr. gna`qos the jaw + ? a roof.] (Zool.) One of a pair of broad plates, developed from the outer maxillipeds of crabs, and forming a cover for the other mouth organs. [1913 Webster]

