Phylum Porifera
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Phylum Porifera

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General Characteristics. Most are marine; a few live in fresh water one family SpongillidaeMetazoan, with loosely aggregated cells, therefore no organs or true tissues.Asymmetrical or radial symmetryBody with pores (ostia and osculum), canals, and chambers through which a water current flows..
Phylum Porifera

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1. Phylum Porifera

2. General Characteristics Most are marine; a few live in fresh water one family Spongillidae Metazoan, with loosely aggregated cells, therefore no organs or true tissues. Asymmetrical or radial symmetry Body with pores (ostia and osculum), canals, and chambers through which a water current flows.

3. General Characteristics Epidermis of flat pinacocytes; Inner surfaces lined with flagellated collar cells (choanocytes)-create water currents matrix called mesohyl contains amebocytes and skeletal elements Skeleton of calcareous or siliceous crystalline spicules and/or protein fibers (spongin)

4. General Characteristics Digestion intracellular Respiration and excretion by diffusion Nervous system absent All adults sessile and attached to substrate Asexual reproduction by buds or gemmules Sexual reproduction by eggs and sperm Free-swimming ciliated amphiblastula larvae

5. Class Calcarea

6. Class Calcarea also known as Calcispongiae have spicules of calcium carbonate all marine

7. Leucosolenia

8. Grantia (Scypha)

9. Schypha (Spicules)

10. Class - Hexactinellida

11. Class - Hexactinellida Glass sponges; have siliceous spicules, body often cylindrical or funnel shaped

12. Class - Hexactinellida

13. Class - Demospongiae

14. Class - Demospongiae have siliceous spicules,spongin, or both one freshwater family

15. Gemmule

16. Cliona

17. Cliona

18. Cliona killing a coral


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