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Across 2. means “many feet” 4. in some arachnids, an organ that removes wastes and discharges them at the base of the legs 6. touch, taste, equilibrium 7. the most posterior appendage on many crustaceans 10. an arthropod with four pairs of walking legs; a spider, scorpion, mite, or tick 11. a posterior segment of an animal that usually houses the organs of digestion and excretion 14. in arthropods, a structure composed of several segments that have fused to perform specific functions 15. in arachnids and some crustaceans, a body part formed by the fusion of the head with the thorax 16. an excretory organ of some crustaceans that helps regulate the solute concentration of hemolymph 20. in arthropods, a claw used to capture food and for defense 22. in insects, myriapods, or spiders, one of the network of air tubes 24. segmented animal with jointed appendages and an exoskeleton 26. an external opening of a trachea in an insect, myriapod, or spider 28. in the abdomen of an arachnid, an organ for gas exchange with parallel folds that resembles the pages of a book 29. a crustacean with seven pairs of identical legs; examples include sow bugs and pill bugs 30. a tough covering over the cephalothorax of some crustaceans 31. a flat, paddlelike projection at the posterior end of many crustaceans 32. one of 10 bilaterally paired appendages on the abdomen of a crayfish 33. a head appendage in arthropods that is used to manipulate food

Down 1. the process of shedding an exoskeleton or other outer layer on an animal 2. the main excretory organ of most insects and some myriapods and arachnids 3. a pincerlike mouthpart of arthropods 4. an arthropod with mandibles and branched appendages; examples include shrimps, barnacles, crabs, and pill bugs 5. food is ground into a fine paste where it then enters the intestine and this for further digestion and absorption 6. any complex part or organ extending from the body 8. the abundant small plant and animal organisms that drift or swim weakly near the surface of a body of water 9. an eye composed of many light detectors, each with its own lens 12. a movable mouthpart that usually functions in chewing 13. a thoracic appendage in arthropods that is used to manipulate food 17. the free-swimming larva of most crustaceans 18. barnacles’ swimming appendages are replaced by six pairs of long legs called this 19. in arachnids, an appendage that aids in chewing 21. a crustacean with five pairs of legs, such as shrimps, crayfish, and lobsters 23. the structure through which fluid from the silk gland of spiders passes 25. in insects and some crustaceans, the part of the body between the head and the abdomen 27. a sensory appendage on the head of an arthropod