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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.