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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..

Palpus :: Palpus (n.) A feeler; especially, one of the jointed sense organs attached to the mouth organs of insects, arachnids, crustaceans, and annelids; as, the mandibular palpi, maxillary palpi, and labial palpi. The palpi of male spiders serve as sexual organs. Called also palp. See Illust. of Arthrogastra and Orthoptera..

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

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

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

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

Arachnid :: Arachnid (n.) An arachnidan.

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

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

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..

Tant :: Tant (n.) A small scarlet arachnid.

Solifugae :: Solifugae (n. pl.) A division of arachnids having large, powerful fangs and a segmented abdomen; -- called also Solpugidea, and Solpugides..

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

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

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

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

Daddy Longlegs :: Daddy longlegs () An arachnidan of the genus Phalangium, and allied genera, having a small body and four pairs of long legs; -- called also harvestman, carter, and grandfather longlegs..

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..

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..

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