tectum
From ZooTerms (Dictionary of Invertebrate Zoology)
tectum (noun; Latin tectum, roof): 1. (Arthropoda: Chelicerata) In Acari, the blade-shaped prolongation of the exoskeleton to protect an organ or joint; epistome; cervix.
2. (Arthropoda: Crustacea) The central portion of the carina of barnacles.
