From ZooTerms (Dictionary of Invertebrate Zoology)
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hamulus (noun, plural hamuli; Latin hamulus, little hook): 1. A hook or hooklike process.

2. (Arthropoda: Insecta) a. In certain Hymenoptera, a row of minute hooks along the costal margin of the hind wing to unite the front and hind wings in flight; has been spelled humule. b. In male Odonata, one of a pair of anterior(is) and posterior(is) clasps of the genitalia (fenestra) for grasping the female. c. In Siphonaptera, one of a pair of movable sclerites originating from the lateral wall of the aedeagal palliolum.

3. (Platyhelminthes: Trematoda) In monogenetic forms, large hooks on the opisthaptor; anchors.