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Poriferans and Cnidarians

Poriferans and Cnidarians. The “Tissue Animals”. Have tissues but no organs Animal cell structure Have embryonic stages of development. Phylum Porifera. “Pore bearing” the sponges. Sponges . Epidermis Mesenchyme Amoebocytes Spicules Collar cells. Asexual Reproduction. Budding

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Poriferans and Cnidarians

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  1. Poriferans and Cnidarians

  2. The “Tissue Animals” • Have tissues but no organs • Animal cell structure • Have embryonic stages of development

  3. Phylum Porifera “Pore bearing” the sponges

  4. Sponges • Epidermis • Mesenchyme • Amoebocytes • Spicules • Collar cells

  5. Asexual Reproduction • Budding • Regeneration • Gemmules

  6. Sexual Reproduction • A sperm from one sponge unites with an egg from another sponge and forms a zygote.

  7. Phylum Cnidaria the hydra & jellyfish

  8. The Cnidarians • Polyp • sessile body form • mouth and tentacles at one end; basal disc at other end • Medusa • bell-shaped, motile body form

  9. The Hydra • Gastrovascular cavity • Two layers of cells • epidermis • gastrodermis • mesoglea

  10. The Hydra • Tentacles • Cnidoblasts produce nematocysts.

  11. The Hydra • Asexual reproduction • budding • regeneration • Sexual reproduction • testes, ovaries

  12. Other Cnidarians • Jellyfish • Corals • Sea anemones: “flowers of the sea” • Portugeuse man-of-war

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