Cnidaria
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Cnidaria

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Cnidaria Cnidaria Presentation Transcript

  • Phylum Cnidaria
  • DEFINING CHARACTERISTIC OF CNIDARIA Contain Stinging cells Didermic Sac Body Plan Gastro-vascular Cavity
  • STINGING CELL
  • STINGING CELL Specialized Cell is Cnidocyte that contain stinging organelle Nematocyst. Nematocyst – has barbed and poisonous thread. They produced toxin when discharged, they help in the capture of prey or for defense
  • WHAT WILL HAPPEN WHEN JELLYFISH STING YOUR SKIN?
  • How to Soothe a Jellyfish Sting 1. REMAIN CALM! THERE ARE ONLY A FEW JELLY FISH WHOSE STING IS DEADLY OR POTENTIALLY DEADLY. PANICKING WOULD BE UNHELPFUL.
  • 2. Get out of the water! Jellyfish stings can be extremely painful and you could lose your ability to swim
  • 3. Remove stingers by applying shaving foam to the sting area. Scrape the skin closely with a razor, knife blade, or credit card. If you don't have a plastic card, rub sand over it to dislodge the stingers and rinse it off in salt water
  • 4. Deactivate the remaining stingers. In the case of a plain old jellyfish sting, blot or pour 3-10% percent acetic acid solution (white vinegar) on the sting with a clean cloth.
  • 5. Remove any venom in the skin by applying a paste of baking soda and water and using a cloth covering. If possible, reapply paste every 15-20 minutes.
  • 6. Take a very hot shower. A 15-20 minute hot shower can deactivate the venom of some jellyfish
  • 7. Soothe any remaining skin irritations with overthe-counter antihistamine pills.
  • 8. Get medical care if the victim is experiencing any symptoms worse than skin irritation or has trouble breathing.
  • 10. Severe stings need to be wrapped after treatment to keep them from getting infected
  • DIDERMIC Consist of 2 tissue layer Epidermic  Gastrodermis 
  • SAC BODY PLAN  The mouth serve as an incurrent and excurrent opening
  • GASTROVASCULAR CAVITY Play an important role in Digestion. Inner Cell depend on water within the cavity for gas exchange and excretion.
  • ANATOMY OF CNIDARIA
  • Tentacles – contain sting cell use in capturing prey  Oral arm – Hold the prey then pass out in the mouth  Mouth – serve for food entrance, metabolic waste exit and passageway of gametes. 
  • Nerve Net – nerve cells interconnect to form a nerve net below the epidermis  Epidermis – outer covering of Cnidaria  Gonads – responsible for production of gametes 
  • REPRODUCTION
  • The life cycle of Cnidaria include two phases: When there is an alteration of Generation  Medusa – the sexual phase  Polyp – asexual phase 
  •  Polyp – has mouth on the dorsal surface and tentacles that point upward  Medusa – has a mouth on the ventral surface and tentacles that point downward
  • LIFE CYCLE OF CNIDARIA
  • The adult male and female sea jellies releases gametes 2. Fertilization occur in the water. Zygote will form that eventually develop into a planula 3. The planula will eventually settle and attaches to a firm surface. The planula then develops into a polyp with a mouth and tentacles on its unattached end. The polyp will develop a stack of medusa that will bud off. 4. The polyp will bud off immature sea jelly or ephyra then it will develop into an adult sea jelly. 1.
  • CLASSES OF CNIDARIA •Scyphozoa •Anthozoa •Hydrozoa •Cubozoa
  • SCYPHOZOA Cnidaria with dominant medusae Aurelia aurita Cyanea capillata
  • CUBOZOA  The medusae is in cuboidal shape with tentacles that hang from each corner of bell Chironex flexeri  Chiropsalmus quadrumanus 
  • STAUROZOA  Goblet-shaped, sessile, attached by oral stalk to sea weeds  Halyclystus auricula
  • HYDROZOA Cnidaria with polyp dominant  One of the few fresh water cnidaria  They are also found in attached to underwater plant or rocks, mostly in lakes and ponds.  Hydra  Obelia 
  • ANTHOZOA  Stony coral, with no medusae have a calcium carbonate exoskeleton that contribute greatly building of coral reef. Fungia  Corallium 
  • IMPORTANCE OF CNIDARIA
  • THEY PROVIDE HABITAT FOR MANY MARINE ORGANISM
  • THE REEF DECREASES THE FORCE OF THE INCOMING WAVES, RESULTING IN PEACERFUL WATER AT THE SHORE
  • SEA CORALS ARE GOOD INDICATOR OF ENVIRONMENTAL CHANGES. SEA CORALS ARE VERY SENSITIVE TO SUCH FACTOR AS WATER POLLUTION
  • Multiple Choice. Choose the best answer in the following question 1. The jelly like layer in the cnidaria body wall a.Nematocyst c. Mesoglea b. Mesohyl d.Gastrocoel 2.The asexual phase of cnidaria a.Polyp c. Both polyp and medusa c. Medusa d. None 3.What do you call the free living larva of Cnidaria? a.Planula b. Clydippids c.Nymphs d. Lanula 4.Which of the following is NOT a Cnidarian Characterisitic? a.Contain stinging cell c. Didermic b.Triploblastic d.Sac Body Plan 5.Halyclystus belong to what class? a.Staurozoa c. Hydrozoa b.Cubozoa d. Anthozoa