1. Arthropods

2. Arthropods Segmented body Tough Exoskeleton: chitin
Jointed appendages: legs and antennae
Classified:
body segments and appendages
particularly mouth parts

3. Arthropods With evolution: Molting: sheds exoskeleton
fewer body segments
specialized appendages for feeding, movement, and other functions
Molting: sheds exoskeleton

4. Other Characteristics
Bilateral Symmetry
Feeding: herbivores, carnivores, omnivores
Circulation: Open-Circulatory System

5. More Info Respiration: branched tracheal tubes or book lungs
Excretion: Malpighian tubes
Response to Stimuli: well developed
Movement: muscles contract & pull on exoskeleton
Ex: spiders, insects, crustaceans

6. Crustaceans Crayfish, Crabs, Lobsters, & Barnacles 2 pairs of antennae
2 or 3 body sections
Mandibles: chewing mouthparts

7. Chelicerates Chelicerae: fangs used to stab and paralyze prey
Horseshoe Crabs, Spiders, Mites, Ticks, & Scorpions
Mouthparts
Chelicerae: fangs used to stab and paralyze prey
Pedipalps: grab prey
2 body sections; 8 legs

8. Uniramians Centipedes, Millipedes, & Insects Jaws; 1 pair of antennae
Unbranched appendages

9. Insects
Body divided into head, thorax, & abdomen
3 pairs of legs

10. Metamorphosis Process of changing shape and form
Incomplete: similar appearance through out life
Nymphs: lack functional sexual organs & wings
Complete
Larva: undergo finial molt  pupa
Pupa  Adult; completely different animal
Lady bugs, butterflies

11. Metamorphosis

12. Life as an Insect Pheromones: chemical messengers
Signal alarm or death
Male/female courtship
Societies: group that works and lives together
ants, bees, termites