From ZooTerms (Dictionary of Invertebrate Zoology)
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scolus (noun; plural scoli; Greek skolos, pointed object): 1. Thorny processes of the body-wall.

2. (Arthropoda: Insecta) a. In Coleoptera, long branched projection of coccinellid beetles. b. In Lepidoptera, characteristic of nymphalid and saturniid larvae; sphingid larvae also have a similar process in the anal horn.