1. Agenda 5/16 Crayfish Intro PowerPoint Crawdad Hole Song Dissections: External Anatomy

2. Crayfish

4. Dirty Jobs: Crawdads http://www.discovery.com/tv-shows/dirty- jobs/videos/crawfish-catcher.htm

5. I. External Features A.Two segments: 1.Cephalothorax: a.Fused head and thorax b.13 segments covered by a hard carapace 2.Abdomen: a.7 segments

6. Abdomen

7. Cephalothorax

8. Carapace (Cephalothorax)

9. I. External Features Cont. C.Head 1.Most anterior region a.Antennae, antennules, eyes, and mouthparts D.Thorax 1.Posterior to the head a.walking legs and chelipeds attached b.Contains heart, liver, and gills

10. External View (Dorsal)

11. External View (Ventral)

12. Antennae

13. Antennule

14. Eye

15. II. Movement A.Walking Legs 1.Flexion, extension, and rotation B.Swimmerets 1.Creates currents to bring O 2 to gills C.Uropods 1.Act as paddle for rapid movement

16. Walking Leg

17. Swimmeret

18. Uropod

19. II. Movement Cont. A.Telson 1.Between uropods, houses anuses 2.Further aids in rapid movement B.Chelipeds 1.Self defense 2.Grab and manipulate food

20. Cheliped

21. Telson

22. Agenda 5/19 PowerPoint: Crayfish Video: Crayfish Dissection Dissection: external #16-18 Internal # 1-13

23. III. Digestive System A.Mouth 1.Food enters after broken down by structures B.Mandibles 1.Bite and crush food C.1 st /2 nd maxillae 1.Move food to throw into mouth D.Maxillipeds 1.Food manipulation

24. Mandible

25. Maxilla

26. Maxillaped

27. III. Digestive System Cont. A.Esophagus 1.Carries food from mouth to stomach B.Cardiac stomach 1.Stores and chews food C.Liver (digestive gland) 1.Makes digestive enzymes 2.Completes digestion and absorbs nutrients D.Intestine 1.Carries solid waste to anus E.Anus

28. Digestive Gland (Dorsal)

29. Digestive Gland (Lateral)

30. Esophagus

31. Intestine

32. Stomach

33. IV. Circulatory System A.Heart 1.Pumps blood B.Dorsal abdominal artery 1.Carries blood from heart to abdomen

34. Heart

35. V. Respiratory System A.Gills 1.Used for getting O 2 from water

36. Gill

37. VI. Excretory System A.Green Gland 1.Filters liquid waste from blood 2.Like a primitive kidney

38. Green Gland

39. VII. Nervous System A.Brain 1.Coordinates senses and nerve messages B.Ventral Nerve Cord 1.Carries nerve impulses C.Eyes 1.Focus light D.Antenna/antennules 1.Used for touch, taste, smell, and balance

40. Ventral Nerve Cord

41. Ventral Nerve Chord Posterior

43. Eggs

44. Female

45. Male

46. Gonad

47. Crayfish birth Note* Swimmerets hold larva http://www.watchknowlearn.org/Video.aspx ?VideoID=39090&CategoryID=13835http://www.watchknowlearn.org/Video.aspx ?VideoID=39090&CategoryID=13835

48. Dissection https://www.youtube.com/watch?v=W7F0j Zgdc8Ahttps://www.youtube.com/watch?v=W7F0j Zgdc8A

49. Crawdad song https://www.youtube.com/watch?v=23u8CeiN 9OY

50. http://www.gvsd.org/Page/1738 http://www.watchknowlearn.org/Video.aspx ?VideoID=43138&CategoryID=13835http://www.watchknowlearn.org/Video.aspx ?VideoID=43138&CategoryID=13835