From ZooTerms (Dictionary of Invertebrate Zoology)
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clypeus (noun; Latin clypeus, shield): 1. (Arthropoda: Chelicerata) The anterior tagma between eyes and cheliceral bases in arachnids.

2. (Arthropoda: Crustacea) That part of the head bearing the labrum.

3. (Arthropoda: Insecta) The sclerite on the lower part of the face, usually separated from the frons by an epistomal sulcus or suture, and maybe divided into an anteclypeus and a postclypeus.

4. (Brachiopoda) That part of the cephalon bearing the labrum; a plate situated anteromedially on the head formed by fusion of basal segments of the antennae.