Invertebrates 1 copyright cmassengale

Invertebrate Phyla Sponges (Porifera) Cnidarians Platyhelminthes Nematodes Mollusks Annelids Echinoderms Arthropods 2

Characteristics 3

Sponges (Porifera) Most primitive Cells relatively independent Mostly marine No Symmetry 4

Cnidarians Mostly marine Radial Symmetry 5

Cnidarians-examples: Jellyfish Hydra Coral Sea anemone 6

Platyhelminthes Flatworms Bilateral symmetry Cephalization-have a head 7

Planarian – freshwater flatworm 8 Regeneration!

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

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

Brittle Star – An Echinoderm 13

Arthropods Joint-legged animals External skeleton Huge variation – mostly insects 14