Dipoblastic.

Acellular Mesgolea.

Radial/Biradial symmetry.

Classes:

Polyp or Medusae

GVC.

Extracellular digestion.

Biradial Symmetry.

Important component of marine food chain.

Dipoblastic.

Comb plates fused with cilia.

Basal animals.

No tissues or embryonic germ layers, cellular level of organization.

Sessile filter feeders with flagellated collar cells (Choanocytes)

Intracellular digestion within a spongocoel.

Often no symmetry, amorphous.

Use: Sponge-derived antibiotics

Phylum Cnidaria

Example: True jellies.

Phylum Cnidaria.

Example: Corals & anemones

Some with lophophores.

Some with trocophore larvae.

(Flatworms)

Tripoblastic

Beginnings of cephalization associated with locomotion.

Dorsoventrally flattened.

One way digestive system.

Extra cellular digestion.

Genus Dugesia.

Planaria, free living tubellarian

(Rotifers)

Shape is correlated with life mode.

Primarily freshwater predator.

Phylum Platyhelminthes

Free-living flatworms

Example: Dugesia

Phylum Platyhelminthes

 Example: Tapeworm

Class Trematoda

Phylum Platyhelminthes

Trematodes/flukes.

Example: Liver fluke.