1. Phylum Cnidaria - Coelenterata (Cnido = nettle)

2. Jellyfish - not real fish

3. Blind sac- a bag with only one opening Diploblastic - ~epidermis functions in protection, mucus, flagella and nematosysts sensory reception food capture respiration excretion ~mesoglea functions in body support cements epithelia nerve and muscle pathways diffusion pathway

4. ~endoderm = gastrodermis functions in digestion enzyme secretion food uptake respiration excretion

5. Everting intracellular organelles (cnidae) ~nematosysts = stining capsules small hypodermic syringes venom neurotoxic (nerves) myotoxic (muscles) hemolytic (destroys RBC’s) necrotic (digests tissue) not all of the 30 types inject venom ~spirocysts - adhesive organslles anmones, corals and the like ~ptychocysts - used in the construction of tubes of tube dwelling anemones

6. nematocyst

7. Digestion is extracellular and intracellular Skeleton hydrostatic- fluid filled, muscels operate against an incompressable fluid hard skeleton as with corals Reproduction - ~metagenesis---alternation of generations polyp or polyp colony = asexual stage medusa = sexual stage

8. ~Larva = planula ~dioecious or monoecious

9. Classsification ~class hydrozoa (hydra, hydroids, siphonophores, hydrocorals) no mesentaries or septa in coelentron gastrodermis lacks nematocysts hydromedusae have velum = a small shelf of tissue projecting in from bell margin structure perisarc=non-living outer protective sheath coenosarc=living tissue of hydrozoan within perisarc hydrocaulus=stalk of colony thecate - where the stalk and polyps surrounded by perisarc hydrothecate=feeding polyp gonotheca = reproductive polyp athecate- only stalk surrounded by perisarc

10. Hydromedusae - free living, ‘pelagic’

12. Gonads visible

13. Aequoria

14. Hydra-common freshwater form

15. Hydra, budding

16. Obelia- thecate marine hydroid

17. Hydractinia symbiotic, athecate marine hydroid Pagurus

18. Velella velella - by the wind sailor

20. Fire coral

21. hydrocoral

22. Physalia - Portugese man of war

23. ~class Scyphozoa--true jellyfish Tetramerous - 4 parter No velum Gastrovascular cavity gastric pouches gastric filiments gastrodermal nematocysts Manubrium Rhopalium = sensory organs statocyst chemosensory pits ocellus Most dioeceous - planula Diversity

24. cassiopea

25. Chrysaora

26. Aurelia - moon jelly

28. Pelagia

29. ~Class cubozoa - box jellies Chironex = sea wasp

30. ~Class Anthozoa- anemones, true corals, sea fans, sea pens, soft corals anemones, zoanthids General characteristics- radial symmetry nematocysts 1. Tentacles 2. Pharynx 3. Siphonoglyph 4. Gastrovascular cavity 5. Primary septum 6. secondary septum 7.tertiary septum 8. Acontia- nematocysts 9. Pedal disc

31. Mouth K.O.D.

32. Aggregating anemone - Anthopleura elegantissima

33. A. xanthogrammica. in the surf zone

34. A. xanthogrammica…closed with sand

35. Malu-movement

36. Hermassinda crasicornis and red anemones

37. Clown fish

38. Octocorals - 8 parter radial symmetry-skeleton-colonial Soft corals

39. Sea pen

40. Sea fan- Also sea pansies, sea whils Anthozoans- prostaglandins painkillers coral skeleton used in human bone repair