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Chelicera :: Chelicera (n.) One of the anterior pair of mouth organs, terminated by a pincherlike claw, in scorpions and allied Arachnida. They are homologous with the falcers of spiders, and probably with the mandibles of insects..

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..

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..

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..

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

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..

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

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

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

Arthrogastra :: Arthrogastra (n. pl.) A division of the Arachnida, having the abdomen annulated, including the scorpions, harvestmen, etc.; pedipalpi..

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..

Arachnidial :: Arachnidial (a.) Of or pertaining to the Arachnida.

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

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

Cephalothorax :: Cephalothorax (n.) The anterior portion of any one of the Arachnida and higher Crustacea, consisting of the united head and thorax..

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

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

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

Spider :: Spider (n.) Any one of numerous species of arachnids comprising the order Araneina. Spiders have the mandibles converted into poison fangs, or falcers. The abdomen is large and not segmented, with two or three pairs of spinnerets near the end, by means of which they spin threads of silk to form cocoons, or nests, to protect their eggs and young. Many species spin also complex webs to entrap the insects upon which they prey. The eyes are usually eight in number (rarely six), and are situated on t

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