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

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

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

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

Arachnology :: Arachnology (n.) The department of zoology which treats of spiders and other Arachnida.

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

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

Scorpion :: Scorpion (n.) Any one of numerous species of pulmonate arachnids of the order Scorpiones, having a suctorial mouth, large claw-bearing palpi, and a caudal sting..

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..

Acaridan :: Acaridan (n.) One of a group of arachnids, including the mites and ticks..

Hexapoda :: Hexapoda (n. pl.) The true, or six-legged, insects; insects other than myriapods and arachnids..

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

Arachnid :: Arachnid (n.) An arachnidan.

Spiracle :: Spiracle (n.) One of the external openings communicating with the air tubes or tracheae of insects, myriapods, and arachnids. They are variable in number, and are usually situated on the sides of the thorax and abdomen, a pair to a segment. These openings are usually elliptical, and capable of being closed. See Illust. under Coleoptera..

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

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

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

Arctisca :: Arctisca (n. pl.) A group of Arachnida. See Illust. in Appendix.

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..

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..

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