any small hook or hook-like process; - in Odonata (dragonflies and damselflies) , it is an unusually forked appendage of the second segment of the male, also termed genital hamule or hamules; - in Hymenoptera (ants, bees and wasps), the hamuli are minute hooks at the front edge of the hind wings which temporarily attach to the forewings while in flight; - in tree-crickets, they are the hook like processes of the genitalia.