Invertebrates

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Across
  1. 6. genus of flowering plants belonging to cnidarians
  2. 7. phylum of animals including starfish and sea urchins
  3. 9. class of molluscs with internal shell and tentacles
  4. 15. possible in poriferans, cnidarians, and worms, but not in molluscs and echinoderms
  5. 19. class of echinoderms including starfish
  6. 21. groups of gastropods without shells
  7. 22. animals with soft, elongated bodies and bilateral symmetry
  8. 23. phylum of animals including sponges
Down
  1. 1. class of molluscs with a single, spiral-shaped shell
  2. 2. class of echinoderms including sea urchins
  3. 3. class of molluscs with shell formed by two valves
  4. 4. cell in cnidarian tentacles that injects venom into prey
  5. 5. exterior part of molluscs that creates shell
  6. 8. phylum of animals including jellyfish, hydras, and corals
  7. 10. sponge cell that captures food
  8. 11. phase of cnidarians that reproduce sexually
  9. 12. phylum of animals including bivalves, gastropods, and cephalopods
  10. 13. found in cnidarians and cephalopods
  11. 14. symmetry in two halves
  12. 16. symmetry about a central axis
  13. 17. phase of cnidarians that reproduce asexually
  14. 18. system used by echinoderms to move around
  15. 20. part of molluscs with various purposes, often movement