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Invertebrates copyright cmassengale 1 Invertebrate Phyla • • • • • • • • Sponges Cnidarians Platyhelminthes Nematodes Mollusks Annelids Echinoderms Arthropods 3 Sponges (Porifera) • Most primitive • Cells relatively independent • Mostly marine • No Symmetry 4 Cnidarians • Mostly marine • Radial Symmetry 5 Cnidarians • Jellyfish • Hydra • Coral •Sea anemone •Portuguese Man-O-War 6 Platyhelminthes • Flatworms • Bilateral symmetry • Cephalization 7 Planarian – freshwater flatworm 8 Nematodes • Tube-like digestive tract • Roundworms! • Mouth and anus • No segmentation 9 Mollusks • Clams, snails, squids • Varied habitats – Marine – Freshwater – Terrestrial 10 Annelids • Segmented worms • Common earthworm • Leech 11 Arthropods • Joint-legged animals • External skeleton • Huge variation – mostly insects 12 Echinoderms • Always marine • Starfishes, sea urchins, sea lilies • Spiny skin 13 Brittle Star – An Echinoderm 14 15
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