1. 1 Phylum Echinodermata BIO 2215 Oklahoma City Community College Dennis Anderson

2. 2 Phylum Echinodermata Radial symmetry No head or brain Spiny skin Water vascular system No excretory organs Deuterostome Bilateral lavrae

3. 3 Porifera Platyhelmithes Mollusca Arthropoda Hemichordata Cnidaria Nemertea Annelida Echinodermata Chordata Lophophores Protozoans

4. 4 Class Asteroidea Star Fish 5 or more tapering arms Mouth on underside Endoskeleton –Ossicles Tube feet Feed on molluscs and sea urchins

5. 5

6. 6

7. 7 Aboral Surface Madreporite

8. 8 Pedicellaria SpineSpine PedicellariaPedicellaria DermalbranchiaDermalbranchia

9. 9 Class Asteroidea Aboral surface Oral surface Tube feet and ambulacralgroove ambulacralgroove

10. 10 Water vascular system MadreporiteMadreporite Ring canal Stone canal Radial canal Lateral canal Tube feet PolianvesiclesPolianvesicles Tiedemann’sbodiesTiedemann’sbodies

11. 11 Tube feet

12. 12 Tube foot Lateral canal AmpullaAmpulla Body wall Tube foot RetractormusclesRetractormuscles SuckerSucker Podial muscle

13. 13 Movement of tube feet

14. 14 Water-Vascular System of a Sea Star Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

15. 15 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Body Wall and Internal Anatomy of a Sea Star

16. 16

17. 17 Feeding

18. 18 Class Ophiuroidea Brittle Stars and Basket Stars Central disc with distinct arms No pedicellariae Tube feet lack suckers and ampulla

19. 19 Brittle star Bursal slit MouthMouth

20. 20 Basket Star

21. 21 Class Echinoidea Sea Urchins Shell (test) encloses body –Ossicles form plates No arms Long spines –Movement –Venom

22. 22 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Internal Anatomy of a Sea Urchin

23. 23 Class Echinoidea Sand Dollar Burrow in sand

24. 24 Sand dollar MadreporiteMadreporite GonoporeGonopore Ambulacral region LunuleLunule

25. 25 Class Holothuroidea Sea Cucumbers Soft body with reduced ossicles Tentacles near mouth Respiratory tree –Breaths through anus

26. 26

27. 27 Class Cridoidea Feather Stars and Sea Lilies Most primitive Feather like arms used for suspension feeding –Plankton Tube feet trap planktonic organism Cilia in ambulacral grooves carry food to mouth

28. 28 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Class Crinoidea: Sea Lily Attach to substrate with stalk

29. 29 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. Class Crinoidea: Feather Star Swim and crawl

30. 30 Central disk AnusAnus MouthMouth PinnulePinnule

31. 31 Ancestral Echinoderms

32. 32 Ancestral Echinoderms

33. 33 The End