1. Bellringer Mon, 04/26 How many arms does a starfish have? What kingdom is it in? What phylum is it in? If you don’t know, look it up in book!!! YOU WILL NOT BE ALLOWED TO DISSECT UNLESS YOU KNOW THIS INFO!!!! Reminders: HW #12 due Friday!!!

4. Starfish

5. Common N. Atlantic Starfish

6. Oreasteridae

7. Bahamas Starfish

8. Euretaster

9. Crown of thorns starfish

10. Fromia

11. Millipede 9 armed

12. Purple-spined Sea Urchin

13. Sunflower

14. Spiny Starfish

15. Brittle Stars

16. BAT STARS

17. Starfish Fossil

18. How do we classify them? Member of ECHINODERM phylum –Echinos – spiny –Derma – skin

19. Skeletal system Have an endoskeleton (inside skeleton)

20. Vascular (Blood) System –Water Vascular System (Water for blood) –Capture food –Move –Gas exchange/waste exchange

21. Symmetry There are 2 kinds of symmetry… Starfish have radial symmetry

22. 1. Bilateral Symmetry Organism can only be divided to form equal halves

23. 2. Radial Symmetry Many ways to cut organism giving roughly identical pieces

24. Radial Symmetry

25. Movement A network of water-filled canals, that branches into tube feet

26. Feeding Carnivorous. Uses its arms and tube feet to capture the prey.

28. Regeneration Replacement or regrowth of missing body parts

29. Reproduction Asexually by regeneration or sexually. Have either testes or ovaries as gonads in each arm. During certain time of the year, males and females gather and release sperm and eggs in the water, where fertilization takes place. At least 3 million eggs at one time. Regeneration of 3 arms!

31. Dissection

32. External Anatomy- 10 mins 5 rays (arms) Sieve plate Spines Dorsal/ventral Tube feet Mouth

39. EXPECTATIONS Dissection with a partner or virtual dissection You need- sheet from yesterday, starfish guide* tray, apron, goggles, scissors* starfish (from me) Before you begin: clear desks During: check off all parts you see and identify After: clean desks, throw away everything, rinse tray, scissors, put back by sink! Rules: respect, no joking, no yelling, no horseplay, NO WARNINGS! You only have 35 mins!