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ARTHROPODS

ARTHROPODS. Arthropod Characteristics. Bilateral symmetry Exoskeleton made of chitin Shed (Molted) with growth Protection Prevent water loss Support body Attach to muscles. Jointed appendages Allows flexibility and different tasks Have body segments Related to segmented worms.

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ARTHROPODS

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  1. ARTHROPODS

  2. Arthropod Characteristics • Bilateral symmetry • Exoskeleton made of chitin • Shed (Molted) with growth • Protection • Prevent water loss • Support body • Attach to muscles • Jointed appendages • Allows flexibility and different tasks • Have body segments • Related to segmented worms

  3. Reproduction • Usually Sexual: • Separate genders • Courtship rituals • Sounds • Gifts • Dances • Usually internal fertilization • Some Asexual: • Unfertilized egg grows into new individual

  4. Preying Mantis Mating…creepy!

  5. Major Arthropod Classes • Crustaceans • Vital to aquatic ecosystems • Two body sections • Cephalothorax • Abdomen • Various appendages • Sensory antennae on head • Jaw mandibles to feed • Legs = walking • Claws = defense; hunting • Ex: Barnacles, Crab, Lobster

  6. Major Arthropod Classes • Arachnids • Lack antennae & jaw mandibles • 6 pairs of appendages • 1 pair = Fanglike mouth parts inject venom • 1 pair = Grasp and hold prey • 4 pairs = walking legs • ~60,000 species • Silk released from spinnerets • Ex: Scorpions, Mites, Ticks

  7. Major Arthropod Classes • Insects • Dominant land arthropods • Body divided into 3 sections (see pic) • 3 pairs of walking legs • Many w/ 2 sets of wings • Most go through metamorphosis • 1st to fly • Some spread disease • This is the final bullet of the school year…congrats! Incomplete metamorphosis: nymph has no wings of sex organs Complete metamorphosis: body completely reorganized Mosquitoes spread malaria and West Nile Virus Ticks spread Lyme Disease

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