1. STARFISH DISSECTION

3. STARFISH LATIN meaning KINGDOM _____________ PHYLUM _____________________________ CLASS _______________________________ ANIMALIA ECHINODERMATA “spiny skin ” ASTEROIDEA “star-like”

4. Starfish (sea stars) Come in a variety of colors

5. ... and sizes

6. Not all starfish have 5 arms

7. SYMMETRY ADULTS- Radial LARVA- Bilateral

8. PENTARADIAL (5 armed starfish)

10. SPINY SKIN SPINES for protection connect to ENDOSKELETON inside underneath skin

11. OSSICLES Calcium carbonate plates form endoskeleton inside

12. PEDICELLARIAE (sing. Pedicellaria) Keep surface clear of organisms

13. SKIN GILLS Hollow skin tubes that project from skin for increased surface area connect to coelom inside

14. Skin gills between spines EXCHANGE GASES and EXCRETE NITROGEN WASTE

15. TUBE FEET surfaces Can exchange gases and excrete nitrogen waste

16. EYESPOTS Sense light/dark

17. ORAL VIEW

19. Opening to water vascular system Madreporite

21. WATER VASCULAR SYSTEM

23. ORAL VIEW MOUTH

25. AMBULACRAL GROOVE TUBE FEET sit in GROOVE

26. TUBE FEET Used for feeding & locomotion

27. TUBE FEET Used for feeding & locomotion Can exchange gases and excrete nitrogen waste

28. CUT TRIVIUM

29. DIGESTIVE GLAND Makes BILE ABSORBS NUTRIENTS

31. http://www.k-state.edu/organismic/echinoderms_and_protochordates.htm

32. 2 part STOMACH

33. DIGESTIVE SYSTEM DIGESTIVE GLANDS DIGESTIVE GLANDS MOUTH ANUS

34. CARDIAC stomach connects to mouth (extruded during feeding) PYLORIC stomach connects to digestive glands and ANUS

35. EUCOELOM OPEN CIRCULATION

36. ENDOSKELETON made of OSSICLES

37. OSSICLES Calcium carbonate plates form endoskeleton inside

39. GONADS

40. AMBULACRAL RIDGE covered by OSSICLES contains RADIAL NERVE (nervous) RADIAL CANAL (water vascular system)

41. AMBULACRAL RIDGE AMPULLAE (tops of tube feet)

42. NERVOUS SYSTEM follows WVS NERVE RING encircles mouth RADIAL NERVES run inside AMBULACRAL RIDGE in each arm

43. SEPARATE SEXES Starfish have 2 sets of gonads (hermaphrodites) Sexual and asexual reproducation (Regeneration)

45. DIGESTIVE GLAND GONAD OSSICLES