Mollusks & Echinoderms

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Across
  1. 2. mollusk pest that eats garden plants
  2. 5. substance secreted by cephalopods that provides protection
  3. 7. the upper side of an echinoderm
  4. 9. mollusk part that produces the shell
  5. 12. class of snails and slugs
  6. 13. larval stage of a mollusk
  7. 14. mollusk with 8 overlapping plates
  8. 17. class of brittle stars
  9. 19. class of clams, oysters and mussels
  10. 20. class of chitons
  11. 21. part of a mollusk that houses organs
  12. 22. class of sea urchins and sand dollars
Down
  1. 1. tongue-like structure that scrapes food
  2. 2. mollusk pest that burrows through wood
  3. 3. structure in cephalopods in place of a foot
  4. 4. means "spiny skin"
  5. 6. class of sea cucumbers
  6. 8. class of octopus and squid
  7. 10. class of sea lilies and feather stars
  8. 11. class of sea stars
  9. 15. made of calcium carbonate
  10. 16. a fleshy pad that some mollusks move around on
  11. 18. means "two shells"