From ZooTerms (Dictionary of Invertebrate Zoology)
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jugum (noun; plural juga; Latin jugum, yoke): 1. (Brachiopoda) The medial connection of the secondary shell between 2 primary lamellae of the spiralia.

2. (Arthropoda: Insecta) a. In Lepidoptera, a lobe-like process at the base of the fore wings, overlapping the hind wings. b. Two lateral lobes on the head of certain Heteroptera, bordering the tylus.

3. (Mollusca: Polyplacophora) Longitudinal ridge of some intermediate chiton valves that may be sharp or rounded.