1. C NIDARIA Hanna, Monica and Maddy

2. P HYLOGENETIC T REE

4. K INGDOM They are the first to show tissue level organization Have no organs. The adult forms are derived from two distinct embryonic germ layers, the ectoderm and the endoderm Higher phyla are triploblastic

5. A NIMALIA Radially symmetric The end of the organism which contains the mouth is the oral end

6. C HARACTERISTICS Members of this phylum live in both fresh and salt water, have tissues and a simple nervous system, and have stinging cells called nematocysts. They display radial symmetry and have two embryonic cell layers.

7. C LASSIFICATION The three classes are grouped according to body plan. Members of the class Hydrozoa have both the polyp and medusa stage in their life cycle. Members of the class Anthozoa have only the polyp stage in their life cycle and are slightly more complex than hydrozoans. Members of the class Scyphozoa have only the medusa stage in their life cycle. They are the most large and complex members of this phylum.

8. L IFE C YCLE

9. F OOD GETTING

10. C IRCULATION

11. Jellyfish do not have a specialized circulatory system. They are able to digest with the help of the gastrodermis that lines the gastrovascular cavity where nutrients from their food is absorbed.

12. GAS EXCHANGE

13. They do not need a respiratory system since their skin is thin enough that air can diffuse in and out of their body

14. Jellyfish have long tentacles with a number of nematocysts inside the cnidoblast which have a trigger and a stinging apparatus. When tentacles make contact with a fish, the thousands of nematocysts fire paralyzing toxins into their prey. When the prey is paralyzed, the tentacles move together to push it into the mouth of the jellyfish.

15. L OCOMOTION

16. The jellyfish squeeze their bodies in order to push the streams of water into a direction. They use the velocity of their bodies as well as the weight of the water when pressure is applied to propel them.

17. O RGANISMS

18. ANEMONE

19. C ORELS

20. J ELLYFISH

21. H YDRA

22. CTENOPHORES

23. O RGANISMS OF THE CNIDARIA

24. C HART Carybdea sivickisi ( BOX JELLY FISH) FIRE CORAL PELAGIARenilla ( FLOWER ANIMAL ) KINGDOMANIMALIA PHYLUMCNIDARIA CLASSCUBOZOAHYDROZOASCYPHOZOAANTHOZOA ORDERCHIRODROPIDAANTHOMEDUSAESEMAEOSTOMAEPENNATULACEA FAMILYCHIRODROPIDAEMILLEPORIDAEPELAGIDAERENILIDAE GENUSCHIRONEXMILLAPORAPELAGIARENILLA SPECIESFLECKERIMILLEPORA ALCICORNIS PELAGIA FLAVEOLA RENILLA AMETHYSTINA

25. F OOD DIGESTION The cells of the gastro dermis distributes digestive acids that pour into a main cavity. The enzymes within the digestive acids begin the process of digestion, which is completed within the vacuoles when the prey is broken down and engulfed by the cells of the gastro dermis.

26. E XCRETION Food is excreted by diffusing through the top of the gastro vascular cavity which is also commonly known as the mouth, after the nutrients is absorbed within the body.

27. I NTERESTING F ACTS Cnidarians are radially symmetrical Cnidarians have tentacles that encircle their mouth. To treat a box jellyfish sting, you have to pour vinegar over the effected area. If left untreated, the venom can impair the heart and can cause death of children within 3 minutes. Cnidaria have no brains or even central nervous systems

28. C HANGES I N C LASSIFICATION Cnidarians were grouped with Ctenophores in the phylum Coelenterata, however their differences caused them to be placed in separate phyla. Cnidarians are classified into four main groups: sessile Anthozoa (sea anemones)(sea pens) swimming Scyphozoa (jellyfish) Cubozoa (box jellies) Staurozoa are now a class in their own rather than a sub-group of Scyphozoa.

29. R EFERENCES http://sicb.org/meetings/2010/symposia/cnidaria.php http://www.google.ca/imgres?q=cnidaria+phylogenetic+tree&um=1&safe=active&sa=N&rls=co m.microsoft:en- ca&hl=en&tbm=isch&tbnid=vq9C83M9uZc39M:&imgrefurl=http://www.unige.ch/cyberdocume nts/theses2001/KaloulisK/these_body.html&docid=PdsYdfzt32QHJM&imgurl=http://www.unig e.ch/cyberdocuments/theses2001/KaloulisK/images/image002.jpg&w=392&h=382&ei=4ExxUb ymGK7b4AP- 84CgBA&zoom=1&biw=1024&bih=585&iact=rc&dur=172&page=1&tbnh=139&tbnw=152&start=0 &ndsp=15&ved=1t:429,r:7,s:0,i:104&tx=76&ty=24 http://www.darwinsgalapagos.com/animals/cnidaria_jellyfish_coral_sea_anemone.htm http://www.google.ca/search?rls=com.microsoft:en- ca&q=who%20belongs%20in%20the%20cnidaria%20family&biw=1024&bih=585&safe=active&surl =1&um=1&ie=UTF- 8&hl=en&tbm=isch&source=og&sa=N&tab=wi&ei=ZVFxUaKIJpGn4APXloGQBA http://animaldiversity.ummz.umich.edu/accounts/Renilla/classification/ http://en.wikipedia.org/wiki/Fire_coral http://animaldiversity.ummz.umich.edu/accounts/Pelagia/classification/