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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.

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Presentation on theme: "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."— Presentation transcript:

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 Todays 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 – CaCO 3 Class Hexactinellida – SiO 4 Class Demospongiae – spongin or SiO 4 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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