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Invertebrates, image, image, image, image, image, image, image, image,…

- - - - Unique Characteristics : exoskeleton (molting), jointed appendages, segmentation
        
        Centipedes
        
        primitive
        
        segmentation
        
        class Chilopoda
        
        one pair of legs per segment
        
        Millipedes
        
        primitive
        
        segmentation
        
        class Diplopodia
        
        2 legs per segment
        
        Crustaceans
        
        two body regions (cephalothorax and abdomen)
        
        gills
        
        large claws
        
        4 pairs of walking legs
        
        Examples
        
        lobster
        
        crayfish
        
        shrimp
        
        Arachnids
        
        2 body regions
        
        no antennae
        
        Examples
        
        spiders
        
        ticks
        
        mites
        
        Insects
        
        3 body regions
        
        metamorphosis
        
        Examples
        
        bees
        
        butterflies
    - - Gastropods (stomach footed)
        
        univalves
        
        snails
        
        abalone
        
        conch
        
        bivalves
        
        clams
        
        oysters
        
        mussels
        
        scallops
      - Cephalopods (head footed)
        
        octopus
        
        squid
      - Unique Characteristics
        
        most have separate sexes, some hermaphroditic
        
        true coelom (body cavity)
        
        muscular foot
        
        gills or lungs in mantle cavity
        
        visceral mass : contains most organs
        
        mantle : soft outer layer of body
  - - - segmentation
      - earthworms are hermaphroditic while others are 2 separate sexes
      - important to soil
      - complete digestive track
      - Examples
        
        segmented worms
        
        earthworms
        
        leeches
  - - - cephalization
      - hermaphroditic
      - many parasites
      - Examples
        
        flatworms
        
        tapeworms
        
        flukes
- - - - Medusa : free swimming, tentacles down
        
        Jellyfish
      - Polyp : sessile, tentacles up
        
        Coral
        
        Hydra
        
        Sea Anemone
      - Cnidocytes - cells that contain stinging poisonous barbs with which they paralyze prey
  - - - Examples
        
        sea urchins
        
        sand dollars
        
        starfish
      - marine ecosystems
      - water vascular system
      - tube feet (suction cups)
      - EXCEPTION : larvae are bilaterally symmetrical