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Pair Of Eyes Near: The gonads arise from a central mass, with long diverticula into the legs. The alimentary tract also is branched into the legs. The nervous system is that of a typical arthropod. There are four eyes in a dorsal tubercle (some deep-sea species have no eyes). In addition to four pairs of legs, a pycnogonid may have a pair of chelicerate appendages (the chelicera may be reduced to nonfunctional knobs or be lacking), a pair of sensory palpi, and in most males a pair of accessory legs located ventrally on the first segment, the ovigers. The male carries the developing legs on these structures, which are used also in some species for cleaning the legs, and the terminal segments are armed with rows of spines which may function as combs.
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.
Long, flat-bodied; some species very slender; cephalo-thorax joined to abdomen by wide segment; abdomen made up of 7 wide segments followed by long, narrow tail of 5 segments which terminates in bulblike structure with sting; pedipalps large, bearing pair of strong pincers; i pair of eyes near midcephalothorax; on each side, near edge of body, group of 2-5 simple eyes; some species have no eyes; 4 pairs of legs attached to thorax, fitted for walking; exoskeleton smooth, shiny, varying from pale yellowish to reddish brown; when scorpion runs, pincers carried horizontally in front and tail curved up over back; length varies from 2-6 inches according to species.
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