1. Sponges

2. Classes of Sponges  There are three different classes of sponges: –______________

3. Sponge Anatomy ______________ cells - line the outside of the sponge ______________ Cells –extend through the body wall –allows water in ______________ Layer – The middle layer of the body wall –Contains amoeboid cells

4. Sponge Anatomy ______________ Cells –move around the sponge –secrete ______________ – calcium carbonate support structures –responsible for digestion. ______________ Cells –Line the internal cavity (spongocoel) –Catch food particles.

5. Canal Systems Allow for water flow throughout the sponge. Three different types…

6. Canal Systems 1.______________ Water enters spongocoel by incurrent openings of the pore cells. Cells lining the spongocoel absorb the nutrients and oxygen Left over water is expelled through the ______________.

7. Canal Systems 2.______________ The body wall is folded and has more ______________

8. Canal Systems 3.______________ Extensively branched

9. Calcareous sponges  Characteristics: –Usually ______________ (4” in height). –Found in shallow waters –Skeletons made of separate ______________ of calcium carbonate.

10. Calcareous sponges  Two different varieties: –Leucosolenia - simplest sponges that have a simple canal system. –Scypha - contain an advanced canal system.

12. Silica sponges  Also called __________ sponges  Characteristics: –Skeleton consists of six-pointed spicules fused in a geometric pattern. –Found in deep, tropical waters. –Possess an ___________ canal system.

16. Elastic sponges  _________ number of sponges.  Characteristics include: –Skeleton consisting of elastic (spongin) fibers or silicon dioxide It is the elastic nature of the skeleton that makes them spongy. –They possess a ________ canal system.