Sponges

Classes of Sponges

There are three different classes of sponges:–______________

–______________

–______________

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

Sponge Anatomy

______________ Cells – move around the sponge– secrete ______________ –

calcium carbonate support structures – responsible for digestion.

______________ Cells – Line the internal cavity (spongocoel)– Catch food particles.

Canal Systems

• Allow for water flow throughout the sponge.

• Three different types…

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

______________.

Canal Systems

2. ______________ • The body wall is folded and has

more ______________

Canal Systems

3. ______________ • Extensively branched

Calcareous sponges

Characteristics:–Usually ______________ (4”

in height).–Found in shallow waters–Skeletons made of separate

______________ of calcium carbonate.

Calcareous sponges

Two different varieties:– Leucosolenia - simplest sponges that

have a simple canal system.– Scypha - contain an advanced canal

system.

Silica sponges

Also called __________ spongesCharacteristics:

– Skeleton consists of six-pointed spicules fused in a geometric pattern.

– Found in deep, tropical waters.

– Possess an ___________ canal system.

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.