linguatulina

from The Century Dictionary.

• A group, ordinal or other, of entoparasitic vermiform arachnidans, represented by the family Linguatulidæ, related to the mites or acarids, bear-animalcules or Arctisca, and Pycnogonida; the tonguelets, tongueworms, or fivemouths.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) An order of wormlike, degraded, parasitic arachnids. They have two pairs of retractile hooks, near the mouth. Called also Pentastomida.