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Across 6. A pair of mouthparts used for biting or cutting in arthropods 7. Cylindrical in shape and sessile, cnidarian body form 9. A class of joint-legged invertebrate animals in the subphylum Chelicerata 10. The "stinging cell" of a cnidarian 13. Rare form of asexual reproduction, where growth and development of embryos occur without fertilization 14. Skin 16. Umbrella-shaped, cnidarian body form 17. A phylum containing sea stars, sea urchins, and sand dollars 25. The ability of an organism to regrow body parts 26. Crustacean shell 28. Openings on the thorax and abdomen of insects that allow the insect to breathe 32. Crustacean larvae form 33. A set of soft overlapping flaps 36. Marine animals that are cnidarians, typically live in colonies of polyps 37. Markings on an insect, usually wings, that have a similar appearance to the mammalian eye 38. Ten-footed crustacean 39. The main opening through which water is filtered in a cnidarian

Down 1. Arthropods that have two legs per segment 2. An organ that produces silk 3. A phylum containing planarians, tapeworms, and flukes 4. Organ that makes gametes in echinoderms 5. A type of exoskeleton supported by fluid pressure 7. Phylum containing sponges 8. Cavity in the digestive tract just past the mouth 11. A tough, translucent material found in arthropod exoskeletons 12. An organism with both male and female reproductive organs 15. Non-parasitic flatworm 18. The body is divided into repeated subunits called segments 19. The lower surface of an organism 20. The upper surface of an organism 21. Echinoderms from class Holothuroidea 22. Inability to move 23. The middle layer of tissue between the ectoderm and endoderm 24. The blood filled body cavity of many invertebrates 27. Head of a crustacean 29. A common human intestinal parasite 30. A form of asexual reproduction where a new organism forms from an outgrowth or bud from a different one 31. A variety of tough but flexible, non-mineral outer coverings of an organism 33. A mollusk that is held together by two hinges or strong muscles 34. One of the three main body parts of an insect 35. Invertebrate with a soft, unsegmented body, protected by a hard, outer shell