Chapter 6: Sponges

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Across
  1. 5. A flagellated solid-bodied larva of most sponges.
  2. 7. opening
  3. 9. Fibrous, collagenous material forming the skeletal network of some sponges.
  4. 12. the nearest approach to a true tissue in sponges is the arrangement in these cells
  5. 13. ameboid cells that move through the mesohyl and perform a number of functions. They phagocytize particles and receive particles for digestion from choanocytes.
  6. 14. one of three canal systems. Somewhat look like larger editions of asconoids. Tubular body and a single osculum. Choanocyte layer is folded back.
  7. 16. One of the 3 classes of living poriferans. Characterized by having calcareous spicules.
  8. 17. A differentiation of Archaeocytes. Characterized by its ability to secrete spicules.
  9. 18. a subset of demospongiae. Characterized by encrusting sponges that have simple spicules or lack spicules entirely.
Down
  1. 1. one of the 3 classes of living poriferans. Characterized by having a skeleton of siliceous spicules, spongin, or both
  2. 2. A differentiation of Archaeocytes. Characterized by its ability to secrete fibrillar collagen.
  3. 3. one of the three canal systems. Has the simplest organization, small and tube-shaped.
  4. 4. one of three canal systems. The most complex organization of sponge types. Most form large masses with numerous oscula.
  5. 6. one of the 3 classes of living poriferans. Characterized by having six-rayed siliceous spicules.
  6. 8. line flagellated canals and chambers; ovoid cells with an end embedded in mesohyl and one end exposed. Exposed end contains flagella.
  7. 9. one of the minute calcareous or siliceous skeletal bodies found in sponges.
  8. 10. Asexual, cyst-like reproductive unit in freshwater sponges; formed in summer or autumn and capable of overwintering.
  9. 11. A thin collagenous mesohyl can be found within this cell. This cell is characterized by collar bodies.
  10. 15. excurrent opening in a sponge