cephalic shield

From ZooTerms (Dictionary of Invertebrate Zoology)
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cephalic shield: 1. (Arthropoda: Crustacea) A chitinous, somewhat calcified covering of the head region formed of fused tergites of cephalic somites, commonly having pleura.

2. (Mollusca: Gastropoda) In Opisthobranchia, an expanded thickening of the dorsal surface of the head that may at times extend dorsally over the back.