Presentation is loading. Please wait.

Presentation is loading. Please wait.

Sponges. Classes of Sponges  There are three different classes of sponges: –Calcarea –Silica (or glass) –Elastic.

Similar presentations


Presentation on theme: "Sponges. Classes of Sponges  There are three different classes of sponges: –Calcarea –Silica (or glass) –Elastic."— Presentation transcript:

1 Sponges

2 Classes of Sponges  There are three different classes of sponges: –Calcarea –Silica (or glass) –Elastic

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

4 Sponge Anatomy Amoeboid Cells –move around the sponge –secrete spicules – calcium carbonate support structures –responsible for digestion. Collar 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.Simple 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 osculum.

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

8 Canal Systems 3.Complex Extensively branched

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

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

11

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

13

14

15

16 Elastic sponges  Largest 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 complex canal system.

17

18

19


Download ppt "Sponges. Classes of Sponges  There are three different classes of sponges: –Calcarea –Silica (or glass) –Elastic."

Similar presentations


Ads by Google