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