Part 1: Scyphozoa

-Has medusea and polyp forms- medusea being most dominant

-GV Cavity divided into 4 gastric pouches

-Gastric filaments on the gonads secrete enzymes and then phagocytize partially digested food

-Digestion occurs intracellulary within food vacuoles

-Most are Dioecious

-Fertilize using their gametes externally

-Class Cubozoa are similar, they have highly toxic nematocysts

Part 2: Hydrozoans

-Also cycle between polyp and medusea forms-equal dominance

-Smaller, more fragile

-Velum: shelf of tissue allows it to squeeze and force water out for movement

-Manubrium: extend from mouth

-Hydra: well known organisms, looked at them in lab, freshwater, no medusea, not colonial (solitary)

-Shared GV cavity

-Polymorphism: Obeilia has feeding polyps (tentacles) reproductive polyps


-Defense polyp: gastrozooids

Part 3: Anthozoans (Subphylum)

-Sea Anemones and coral polyps

-No medlusea phase only polyp body form

-Gametes produced my polyps gastrodermis

-Larger and more complex then hydrozoan polyps

-Has pharynx like a throat allows organism to take in food and swallow

-GV Cavity has mesentaries

-Increasing surface area for digestion

-Subclass Octocorallia: have 8 tentacles, some are called gorgonians, polyps often retracted in daylight,

-Subclass Hexacorallia: many tentacles in multiples of 6, scleractinian corals may build reefs

-Secrete CaCO3 at the base




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