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