claustrum
From ZooTerms (Dictionary of Invertebrate Zoology)
claustrum (noun; Latin claustrum, bar): 1. A bolt or bar.
2. (Arthropoda: Insecta) Any structure uniting wings in flight, i.e., hooks, thickened margins, or a jugum.
3. (Cnidaria: Scyphozoa) The transverse circumferential membrane dividing the stomach pouches in some medusae.
