Porifera & Placazoa

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Across
  1. 4. Solid larval form typical of demosponges
  2. 5. Specialized archaeocytes that secrete spicules
  3. 6. Collar cells that generate water currents and capture food
  4. 8. Microbial partners that can provide much of a sponge’s nutrition
  5. 10. Phylum of extremely simple flat animals with very few cell types
  6. 14. Most complex and most common sponge body form
  7. 16. Flattened surface cells forming the sponge’s outer layer
  8. 17. Glass sponge class with six-rayed siliceous spicules
  9. 18. Small openings where water enters a sponge
  10. 21. Sponge class with calcium carbonate spicules
  11. 22. Gel-like matrix inside a sponge where many cells live
  12. 24. Resistant cyst formed by freshwater sponges
  13. 25. Movement method used by placozoans to creep along surfaces
  14. 26. Feeding strategy where organisms strain particles from water
Down
  1. 1. Large opening where water exits a sponge
  2. 2. Hollow larval form typical of calcareous sponges
  3. 3. Sponge class that contains most freshwater species
  4. 7. Sponge body form with folded walls
  5. 9. Skeletal elements made of silica or calcium carbonate
  6. 11. Pore cells that form openings for incoming water
  7. 12. Intracellular feeding method used by sponges
  8. 13. Flexible collagen protein that supports many sponges
  9. 15. Simplest sponge body form
  10. 19. First described species of placozoan discovered in an aquarium
  11. 20. Amoeboid sponge cells that digest food and can become other cell types
  12. 23. Internal cavity where water circulates in a sponge