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Porifera
- 2. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Simple Sponge Morphology
- 3. Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Sponge Body Forms
- 10. Asconoid Sponge Ostium Spongocoel Osculum Porocyte
- 11. Syconoid Sponge Osculum Ostium Spongocoel Choanocytes Radial Canal Incurrent Canal
- 12. Syconoid Sponge Spongocoel Ostium Choanocytes Radial Canal Incurrent Canal Scypha ( Grantia) xs
- 13. Leuconoid Sponge Choanocyte chamber Osculum Incurrent canal Excurrent canal Incurrent pore
- 18. Physiology
Notas do Editor
- Multicellular Body with pores (ostia) No organs or true tissues. No nervous system Adults sessile & attached to substratum. Skeleton of calcareous spicules , siliceous spicules , spongin or a combination. All aquatic, mostly marine.
- Composed of 3 layers outer layer of flattened contractile cells (pinacocytes) inner non-living mesoglea containing a variety of specialized cells collar cells (choanocytes) which capture food, etc. from water flowing through channels. Exhibit asymmetry or radial symmetry . Reproduction - asexual by buds & gemmules. Sexual by eggs & sperm.
- Calcium carbonate = chalk and limestone Silicon = sand (silicon dioxide) Collagen = main protein of connective tissue and changed into gelatin.
- Fig. 12.11a
- Large sponges filter 1500 liters/day *How important are they to the ocean environment? what would happen if there were too many? Too few? Choanocytes phagocytize Archeocytes digest No respiratory, excretory or nervous systems