1. Phylum Porifera

2. SYMMETRY Asymmetrical: without symmetryAsymmetrical: without symmetry Radially symmetrical: circle base/cut like a pieRadially symmetrical: circle base/cut like a pie Bilaterally symmetrical: cut in half, right/left halves are the sameBilaterally symmetrical: cut in half, right/left halves are the same

3. Characteristics of Sponges The word Porifera means pore-bearingThe word Porifera means pore-bearing No true tissues or organ systemsNo true tissues or organ systems Asymmetrical or Radially symmetricalAsymmetrical or Radially symmetrical Sessile (don’t move)Sessile (don’t move) Filter feeder from H 2 O (plankton)Filter feeder from H 2 O (plankton)

4. 2 types of pores Ostia: (Ostium = singular)Ostia: (Ostium = singular) –Water intake –Many small pores all over sponge Oscula: (Osculum = singular)Oscula: (Osculum = singular) –Water output –A few large pores on top of sponge

5. Collar cell Line internal part of spongeLine internal part of sponge Have flagella which:Have flagella which: –Move H 2 O in and out of sponge –Bring in food & O 2 –Remove waste & CO 2

6. Sponge Anatomy SponginSpongin –The living tissue of the sponge SpiculesSpicules –The skeleton of the sponge

7. Types of Spicules Siliceous: made of silica (glass) Calcareous: made of calcium carbonate Bath sponge: lots of spongin but few or NO spicules

8. Reproduction Asexual (Budding): small part grow and break off and continue to growAsexual (Budding): small part grow and break off and continue to grow Sexual (Spawning): release sperm & eggs out oscula usually on a full moonSexual (Spawning): release sperm & eggs out oscula usually on a full moon

9. Three Basic Shapes Ascon: Least surface areaAscon: Least surface area Sycon: Most surface area (many folds)Sycon: Most surface area (many folds) Leucon: Middle surface areaLeucon: Middle surface area Ascon Sycon Leucon