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copyright cmassengale Invertebrates copyright cmassengale

Invertebrate Phyla Sponges Cnidarians Platyhelminthes Nematodes Mollusks Annelids Echinoderms Arthropods

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

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

Platyhelminthes Flatworms Bilateral symmetry Cephalization

Planarian – freshwater flatworm

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

Mollusks Clams, snails, squids Varied habitats Marine Freshwater Terrestrial

Annelids Segmented worms Common earthworm Leech

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

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

Brittle Star – An Echinoderm

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