cucullus

From ZooTerms (Dictionary of Invertebrate Zoology)
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cucullus (noun; plural cuculli; Latin cucullus, hood): 1. (Arthropoda: Chelicerata) A transverse flap at the anterior edge of the carapace, that completely covers and protects the mouth and chelicerae in Ricinulei spiders and some other orders, where it bears the median eye (first somite of the body).

2. (Arthropoda: Insecta) A hood-like process on the distal or dorsodistal part of the valva of male Lepidoptera, usually hairy or setose.