3. 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

4. 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

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

6. Preying Mantis Mating…creepy!

7. 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

8. 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

9. 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 –1 st 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 Ticks spread Lyme Disease Mosquitoes spread malaria and West Nile Virus