1. Arthropods 7 th Grade Life Science

2. 3 Characteristics of all Arthropods Body Segments Jointed Legs Exoskeleton

3. Exoskeleton– hard outer covering that protects, covers and allows for muscle attachment.

4. 4 Classes of Arthropods Insects Arachnids Centipedes and Millipedes Crustaceans

5. Insects Three Body Regions = Head, Thorax & Abdomen 3 pairs of legs on the thorax Breath through spiracles on the abdomen

6. Metamorphosis—change in shape (meta= change/ morph = shape) Incomplete metamorphosis—nymphs look more and more like adults Complete metamorphosis – larva undergo complete change to become an adult

7. Complete or Incomplete Metamorphosis??

12. 4 Classes of Arthropods Insects Arachnids Centipedes and Millipedes Crustaceans

13. Arachnids Spiders Scorpions Mites and Ticks

14. 4 Classes of Arthropods Insects Arachnids Centipedes and Millipedes Crustaceans

15. Centipedes and Millipedes Centipedes = predators Millipedes = herbivores

16. 4 Classes of Arthropods Insects Arachnids Centipedes and Millipedes Crustaceans

17. Crayfish Crabs Shrimp Pill bugs

18. Crabs

19. Shrimp

20. Pill Bugs

21. Crayfish Kingdom –Animal Phylum – Arthropoda Class – Malacostraca Order – Decapoda Family – Cambaridae Genus -- Cambarus

22. Crayfish Anatomy Form = Function

23. Crayfish Circulatory System Open Circulatory System – Blood is carried from the heart in Arteries. Used blood pools and returns to the heart through ostia (no veins to return blood)

24. Crayfish Circulatory System Ostia -- Holes in the heart where blood re-enters to be pumped

25. Crayfish Respiratory System Gills-- are located at the side of the body Gills function to exchange Oxygen and Carbon Dioxide for Cellular Respiration.

26. Crayfish Respiratory System Gills-- are located at the side of the body Gills function to exchange Oxygen and Carbon Dioxide for Cellular Respiration.

27. Crayfish Digestive System 1.Mandible 2.Esophagus 3.2 Part Stomach 4.Intestine 5.Anus

28. Crayfish Digestive System Two-- Part Stomach

29. Crayfish Digestive System Cardiac Stomach – Stores Food

30. Teeth in stomach help to grind food

31. Crayfish Digestive System Pyloric Stomach – Digestion Occurs (digestive enzymes from digestive gland break down food )

32. Crayfish Digestive System Pyloric Stomach – pyloric muscles on the side of the pyloric stomach help grind food

33. Crayfish Digestive Glands – Produce digestive enzymes similar to our liver

34. Crayfish – Excretory System Anus-- excretes waste from intestine Green Glands – Filter waste out of the crayfish – work similar to our kidneys –Green glands secrete uric acid near the antennae.

35. Green Glands

36. The End