Sponges

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Across
  1. 2. flagellated chambers, most complex, many oscula, no spongocoel, most complex
  2. 4. skeleton is composed of these
  3. 6. glass sponges, 6 rayed silicious spicules
  4. 10. flagellated collar cells that filter
  5. 12. flagellated canals, have radial canals lined with choanocytes, single osculum
  6. 13. form pinacoderm, contractile, similar to a tissue layer
Down
  1. 1. calcium carbonate spicules that are straight or 3/4 rays, all body forms
  2. 3. siliceous but not 6 rayed spicules, all leuconoid body form, largest family
  3. 5. digest food particles
  4. 7. small incurrent pores
  5. 8. gelatinous extracellular matrix
  6. 9. flagellated spongocoels, single oculum, small
  7. 11. water outlets
  8. 13. develop to blastula stage, simplest multicellular animals