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Reading Check

Reading Check. Sponges. Reading Questions, p. 262 - 270. What is the name of the phylum for sponges? What type of symmetry is displayed by sponges? Name one body plan of the sponges. Today’s Objectives.

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Reading Check

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  1. Reading Check Sponges

  2. Reading Questions, p. 262 - 270 • What is the name of the phylum for sponges? • What type of symmetry is displayed by sponges? • Name one body plan of the sponges.

  3. Today’s Objectives • The student will list the characteristics, classification, economic importance, reproductive strategies and organizaiton of members of Phylum Porifera.

  4. Characteristics of Poriferans • Assymmetrical or radially symmetrical • Nonmotile • No tissues or organs • Filter feeders • Three types of cells

  5. Classification – Phylum Porifera • Based on type of spicules • Class Calcarea – CaCO3 • Class Hexactinellida – SiO4 • Class Demospongiae – spongin or SiO4 or both

  6. Class Calcarea

  7. Class Hexactinellida

  8. Class Demospongiae

  9. Cell types of sponges • Pinacocytes • Porocytes • Mesohyl (amoeboid cells) • Choanocytes • Spicules of calcium carbonate or silica • Spongin skeleton

  10. Body Types of Sponges • Ascon • Sycon • Leucon

  11. Reproduction • Monoecious • Do not self-fertilize • Amoeboid cells or choanocytes undergo meiosis to form sperm or egg cells • Sexual reproduction – forms larvae • Asexual reproduction – forms gemmules

  12. Economic Importance • Commercial production of sponges • Artificial vs. Natural

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