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Phylum Porifera

Phylum Porifera

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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 Leucosolenia

  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