Invertebrates 1

Invertebrate Phyla Sponges Cnidarians Platyhelminthes Nematodes Mollusks Annelids Echinoderms Arthropods 2

Sponges (Porifera) Most primitive Cells relatively independent Mostly marine No Symmetry 3

Cnidarians Mostly marine Radial Symmetry 4

Cnidarians Jellyfish Hydra Coral 5 Sea anemone Portuguese Man-O-War

Platyhelminthes Flatworms Bilateral symmetry Cephalization 6

Planarian – freshwater flatworm 7

Nematodes Tube-like digestive tract Roundworms! Mouth and anus No segmentation 8

Mollusks Clams, snails, squids Varied habitats –Marine –Freshwater –Terrestrial 9

Annelids Segmented worms Common earthworm Leech 10

Arthropods Joint-legged animals External skeleton Huge variation – mostly insects 11

Echinoderms Always marine Starfishes, sea urchins, sea lilies Spiny skin 12

Brittle Star – An Echinoderm 13

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