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Bears The Eyes: Spiders have but two divisions to the body. The head and thorax are fused into one structure called the cephalothorax, which means head and thorax. The forward portion of the cephalothorax bears the eyes, the mouthparts, and the pedipalps; the remainder bears the eight jointed legs. Trie cephalothorax is joined to the abdomen by a stalklike pedicel, which means little foot, and bears no appendages.
The eyes of a spider are usually near the front or anterior end of the head, but some are directly on top. They are single facets, hence are called simple eyes. They may number two, four, six, or eight; eight is the usual number. However, the cave spiders lack eyes entirely. Regardless of the number, the eyes are always placed in a definite arrangement. Often some pairs are much larger than others.
Flat-bodied with many somites; i pair legs to each somite; head with i pair many-segmented antennae and 3 pairs mouthparts; first somite of body just behind head bears i pair appendages with poison claws to capture and kill prey; ducts at tips of poison claws from poison glands; head sometimes with cluster of simple eyes; some species may have compound eyes; number of legs varies from 15 to more than 100 pairs; regardless of pairs, number is always odd; extremely swift in movement; secretive; colors vary from pale buff through reddish-browns, even greenish or bluish; sizes vary from less than i inch to 8 inches, depending upon species.
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