Suctorial pertains to the adaptation for sucking or suction,[1] as possessed by marine parasites such as the Cookiecutter shark,[2] specifically in a specialised lip organ enabling attachment to the host.
Suctorial organs of a different form are possessed by the Solifugae arachnids, enabling the climbing of smooth, vertical surfaces.[3]
Another variation on the suctorial organ can be found as part of the glossa proboscis of Masarinae (pollen wasps), enabling nectar feeding from the deep and narrow corolla of flowers.[4]