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INVERTEBRATE ANIMALS SPONGES Simplest animals Soft bodies made of spongin Live in the ocean No body organs Ex: deep sea sponge, luffa sponge JELLYFISH FAMILY Soft bodies that float or attach to bottom Tentacles with stinging cells Mouth underneath body Ex: sea nettle, Portuguese man-o-war, coral, sea anemone WORMS Long, thin bodies No shell or skeleton Can be flat, round, or have segments Can be free living or can be parasites ex: tapeworm, nematodes, earthworm MOLLUSKS Soft bodies Live in water or on land Can have a muscular “foot” Some have shells (snail, oyster, clam) Some have no shell (slug, octopus, squid) SPINY SKIN ANIMALS (echinoderm) thick, sandpapery skin 5 arms, or multiples of 5 suction cups under arms Mouth on the bottom Tongue like sandpaper ex: starfish, sea urchin Notes: THESE INVERTEBRATES ARE ALSO ARTHROPODS: Notes: INSECTS Arthropods (jointed legs) 3 body parts: head, thorax, abdomen 1 pair of antennae 6 legs some have 2 pairs of wings ex: bees, ants, butterflies, beetles, grasshoppers ARACHNIDS Arthropods (jointed legs) 2 body sections: Cephalothorax and abdomen 8 legs mouth parts: fangs, sucking ex: spiders, ticks, scorpions, mites CENTIPEDES Many body segments 1 pair of legs on each segment (look like they have 100 legs) 1 pair of antennae; poisonous fangs Predators – run fast to catch prey MILLIPEDES Many body segments 2 pairs of legs on each segment (look like they have 1000 legs) 1 pair of small antennae Herbivores (eat plants) Curl up when scared CRUSTACEANS Arthropods (jointed legs) Live in water (except for woodlice) Hard shell 2 pairs of antennae 10 total legs; can have pincers ex: shrimp, crabs, lobsters Created by: Thomas Hutson, 4-H Educator, University of Maryland Extension. E-mail: [email protected]