Animal Kingdom

Characteristics Obtain and digest food Contain specialized cells

Body Plans Asymmetrical—sponge Radial Symmetry—hydra Bilateral Symmetry—human Anterior—head Posterior—tail Dorsal—top Ventral--belly

Invertebrates Sponges Filter feeders—take in H20 through pores—goes out of sponge through top opening.

Cnidarians Contain stinging cells called nematocysts Ex. Jellyfish, hydra, sea anemone

Flatworms Acoelomate—no body cavity Ex. Free-living planarians, parasitic flukes and tapeworms

Roundworms Have two body openings. Ex. Ascaris and hookworms

Roundworms

Mollusca 2 body openings, muscular foot, mantle (which secretes a shell in some). Ex. Snails, slugs, clams, octopus, squid

Segmented Worms Have setae—bristles that help them move Ex. Leeches (suck blood) and earthworms

Arthropods Bilateral symmetry, coelomate (fluid-filled cavity), have exoskeletons, have jointed appendages. Ex. arachnids, insects, myriapods, crustaceans

Echinoderms Water vascular system to move and feed Ex. Sea stars, sea urchins, sand dollars