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Araneina :: Araneina (n. pl.) The order of Arachnida that includes the spiders.

Acarina :: Acarina (n. pl.) The group of Arachnida which includes the mites and ticks. Many species are parasitic, and cause diseases like the itch and mange..

Spider :: Spider (n.) Any one of various other arachnids resembling the true spiders, especially certain mites, as the red spider (see under Red)..

Thorax :: Thorax (n.) The second, or middle, region of the body of a crustacean, arachnid, or other articulate animal. In the case of decapod Crustacea, some writers include under the term thorax only the three segments bearing the maxillipeds; others include also the five segments bearing the legs. See Illust. in Appendix..

Arachnoidea :: Arachnoidea (n. pl.) Same as Arachnida.

Tardigrada :: Tardigrada (a.) An order of minute aquatic arachnids; -- called also bear animalcules, sloth animalcules, and water bears..

Arachnidan :: Arachnidan (n.) One of the Arachnida.

Scorpiones :: Scorpiones (n. pl.) A division of arachnids comprising the scorpions.

Arachnidial :: Arachnidial (a.) Pertaining to the arachnidium.

Arthropoda :: Arthropoda (n. pl.) A large division of Articulata, embracing all those that have jointed legs. It includes Insects, Arachnida, Pychnogonida, and Crustacea..

Chela :: Chela (n.) The pincherlike claw of Crustacea and Arachnida.

Arachnid :: Arachnid (n.) An arachnidan.

Pedipalpus :: Pedipalpus (n.) One of the second pair of mouth organs of arachnids. In some they are leglike, but in others, as the scorpion, they terminate in a claw..

Pulmonarian :: Pulmonarian (n.) Any arachnid that breathes by lunglike organs, as the spiders and scorpions. Also used adjectively..

Arachnidium :: Arachnidium (n.) The glandular organ in which the material for the web of spiders is secreted.

Pedipalpi :: Pedipalpi (n pl.) A division of Arachnida, including the whip scorpions (Thelyphonus) and allied forms. Sometimes used in a wider sense to include also the true scorpions..

Stigma :: Stigma (v. t.) One of the apertures of the pulmonary sacs of arachnids. See Illust. of Scorpion.

Octopoda :: Octopoda (n.pl.) Same as Arachnida.

Trachearia :: Trachearia (n.pl.) A division of Arachnida including those that breathe only by means of tracheae. It includes the mites, ticks, false scorpions, and harvestmen..

Linguatulina :: Linguatulina (n. pl.) An order of wormlike, degraded, parasitic arachnids. They have two pairs of retractile hooks, near the mouth. Called also Pentastomida..

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