Zoology
Invertebrate Classification
Arthropods Jointed legs and an exoskeleton scorpion centipede lobster grasshopper spider crab ladybug Mollusks Soft-bodied, sometimes have shells octopus snail conch Worms long cylindrical tube-like body, no limbs, and no eyes earthworms Echinoderms spiny-skinned, suction-tubed “feet” starfish sea urchin sand dollar Poriferans sponges spongia Cnidarians hollow-bodied, tentacles, stinging cells jellyfish