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Phylum Cnidaria - Coelenterata (Cnido = nettle). Jellyfish - not real fish.

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Presentation on theme: "Phylum Cnidaria - Coelenterata (Cnido = nettle). Jellyfish - not real fish."— Presentation transcript:

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

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