- Clawlike, retractile chitinous hooks that encircle or line the rostellum of the scolex of certain taenioid tapeworms for attachment to the intestinal mucosa, with the additional aid of suckers; the hooklets can be withdrawn and the rostellum inverted when the tapeworm moves. Various arrangements and forms of the hooklets characterize the families of taenioid cestodes.
- Hooklets of degenerated scoleces of Echinococcus species in the fluids of the hydatid cyst.
- The hooklets of the oncosphere, by which it claws out of its membrane sheath after hatching and penetrates the host gut wall; these hooklets can later be found in the cercomer of the procercoid or cysticercoid.
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