The document discusses the phylum Cnidaria, which contains about 10,000 species with two main body plans: the medusa and polyp forms. Polyps are cylindrical and often form large colonies by attaching to the sea floor. There are three main classes within Cnidaria: Anthozoa, which lack a medusa stage; Octocorallia whose polyps have 8 tentacles; and Hexacorallia whose polyps have 6 pairs of mesenteries. Examples of genera and species are provided along with their defining characteristics and classifications.

1. Phylum Cnidaria (Polyps) Reporters Alvior, Joeram Segura, Jhomar Villocino, Kathlynn

2. The Cnidarians Contains some 10,000 species 2 body plans Medusa Form Polyp Form

4. Polyps are approximately cylindrical, elongated on the axis of the body. is a sessile form which attaches to the sea floor and often forms large colonies.

5. http://upload.wikimedia.org/wikipedia/commons/thumb/4/49/Coral_polyp.jpg/250px-Coral_polyp.jpg

6. Anthozoans Defining Characteristics: Absence (loss) of medusa stage Absence of operculum and cnidocil Mitochondrial DNA is circular

7. Presence of ciliated groove in the pharyngeal wall leading from the mouth. Coelenteron partitioned by distinct sheets of tissues.

9. http://upload.wikimedia.org/wikipedia/commons/thumb/0/06/PillarCoral.jpg/200px-PillarCoral.jpg Common Name: Pillar coral Scientific Name: Dendrogyra cylindricu

10. Octocorallia Defining Characteristics: Polyps bear 8 tentacles Are subdivided by 8 complete mesenteries

11. http://www.palaeos.com/Invertebrates/Cnidaria/Images/scotinus.jpg Scientific Name: Ptilosarcus gurneyi

12. Hexacorallia Defining Characteristics: Possess numerous tentacles 6 pairs of primary mesenteries

14. Scientific Name: Anemonia viridis http://actiniaria.com/img/anemonia_viridis.jpg

15. Hydrozoa Greater representation of the polyp morph on the Life Cycle. predatory animals which can be solitary or colonial and which mostly live in saltwater

17. Hydra Common freshwater hydras are solitary polyps. It is a cylindrical tube with the aboral end drawn out into a slender stalk, ending in a basal (or pedal) disc for attachment.

19. Common Name: Hydra Scientific Name: Hydra Vulgaris Common Name: Hydra Scientific Name: Hydra Vulgaris

20. Scientific Name: Obelia dichotoma http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20102/bio%20102%20lectures/animal%20diversity/lower%20invertebrates/Obelia_colony_X_40.jpg

22. Classification

23. Dendrogyra cylindricu Kingdom: Animalia Phylum:Cnidaria Class:Anthozoa Order:Scleractinia Suborder:Faviina Family:Meandrinidae Genus: Dendrogyra Species: D. cylindricus

24. Ptilosarcus gurneyi Kingdom: Animalia Subkingdom: Radiata Phylum: Cnidaria Class: Anthozoa Subclass: Octocorallia Order: Pennatulacea Suborder:Subselliflorae Family: Pennatulidae Genus: Ptilosarcus

25. Anemonia viridis Phylum: Cnidaria Class: Anthozoa Subclass: Hexacorallia Superorder: Hexactiniida Order: Actiniaria Suborder: Nynantheae (Thenaria : Endomyaria) Family: Actiniidae Species: : Anemonia viridis

26. Hydra Vulgaris Kingdom:Animalia Subkingdom:Eumetazoa Phylum:Cnidaria Subphylum:Medusozoa Class:Hydrozoa Subclass:Leptolinae Order:Anthomedusae Suborder:Capitata Family:Hydridae Genus: Hydra

27. Obelia dichotoma Kingdom:Animalia Subkingdom:Eumetazoa Phylum:Cnidaria Subphylum:Medusozoa Class:Hydrozoa Subclass:Leptolinae Order:Leptomedusae Suborder:Proboscidoidea Family:Campanulariidae Genus: Obelia

28. References http://en.wikipedia.org/wiki/Polyp/last modified on 27 February 2009, at 00:24 http://taxonomicon.net/ http://upload.wikimedia.org/wikipedia/commons/thumb/4/49/Coral_polyp.jpg/250px-Coral_polyp.jpg http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20102/bio%20102%20lectures/animal%20diversity/lower%20invertebrates/Obelia_colony_X_40.jpg http://actiniaria.com/img/anemonia_viridis.jpg http://upload.wikimedia.org/wikipedia/commons/thumb/0/06/PillarCoral.jpg/200px-PillarCoral.jpg

29. Humann, P. 1993. Reef coral identification.Florida, Caribbean, Bahamas. Jacksonville, Florida, New World Publications,Inc. Superb color photographs and accurate identifications make this by far the best field guide to corals now available; includes sea grasses and some algae. Karlson, R. H., and L. E. Hurd. 1993. Disturbance, coral reef communities, and changing ecological paradigms. Coral Reefs. 12:117–125. The first article of an entire issue devoted to effects of major disturbances, such as El Niño, hurricanes, and floods .