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Cnidarians. Sandra Benito J.H., 9B. Facts. Name : Cnidarians Before: Coelenterata phylum, meaning "hollow guts." Included certain ctenophores and sponges. From the Greek "cnidos," meaning "stinging nettle.“ Number of species currently existing: 10,105 species Taxonomic Classification:

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cnidarians

Cnidarians

Sandra Benito J.H., 9B

slide3

Name: Cnidarians

    • Before: Coelenterata phylum,meaning "hollow guts."
      • Included certain ctenophores and sponges.
    • From the Greek "cnidos," meaning "stinging nettle.“
  • Number of species currently existing: 10,105 species
  • Taxonomic Classification:
    • Domain:Eukaryota
      • Kindom: VI. Animalia
        • Phyla: B.Cnidaria
          • Class:Cubozoa (Box jellies) Swimming
          • Class:Scyphozoa (Jellyfishes) Swimming
          • Class:Anthozoa (Anemones and corals) Sessile
          • Class: Hydrozoa (Hydra) Both
slide7

Found in marine environments.

  • Two basic body types:
    • Polyps
    • Medusae
  • Tentacles
  • Venomous cell organelles (cnidea)
  • Gastrovascular cavity
  • Three-layered body; epidermis, mesoglea and gastrodermis
  • Radially symmetric
  • Carnivorous
  • Solitary or colonial
  • Asexual and/or sexual reproduction
  • Nervous system
  • No cardiovascular system
slide11

Fossil history:

  • Vendian/Ediacaran period
    • 650 to 540 million years ago
    • Soft-bodied organisms
  • Cambrian period - coral fossils
  • Early Ordovician - more developed corals
slide13

Life span is undetermined.

  • Life cycles vary by class and species
    • Some skip stages (e.g. Hydra)
    • Alternation of generations (e.g. Obelia)
      • Asexual reproduction medusae grows on external tissue
      • Matured medusae swim away
      • Sexual cells released
      • Eggs are fertilized
      • Zygote/planula settles and develops into a polyop
slide16

Absorbdissolvedorganicchemicals

  • Filterfoodparticles
  • Nutrientsfromendosymbioticalgae
  • Predate
    • Crustaceans and plankton
    • Medusae forms sink on top of the prey
  • Gastrodem layer releases enzymes that kill the prey
    • Cellsabsorbthenutrients
    • Nutrients spread by diffusion or mobile cells
  • Indigestible remnants are ejected
slide18

No circulatory system

  • No respiratoryorgans
    • Absorb/expel O and CO2 into water
    • Water in digestive cavity is expelled
slide20

Simple sensorysystem

  • Net of nerves made of sensitive neurons
    • Sensitive neurons are connected by chemical synapse
    • Neuron sends neurotransmitter (chemical) to cell group
bibliography
Bibliography
  • New Oxford American Dictionary
  • http://en.wikipedia.org/wiki/Cnidaria
  • http://waynesword.palomar.edu/trnov01.htm#animals
  • http://www.buzzle.com/articles/jellyfish-facts-for-kids.html
  • http://animals.about.com/od/cnidarians/p/cnidaria.htm
  • http://nationalzoo.si.edu/Animals/Invertebrates/Facts/cnidarians/default.cfm
  • http://www.oceaninn.com/the-nature-preserve/cnidarians/
  • http://mapress.com/zootaxa/2011/f/zt03148p012.pdf
  • http://animals.about.com/od/cnidarians/ss/cnidarians.htm
  • http://www.ucmp.berkeley.edu/cnidaria/cnidariafr.html
  • http://www.angelfire.com/moon2/asciencems/
  • http://zoology.muohio.edu/crist/Zoo312/Cnidaria.html
  • http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20102/bio%20102%20lectures/nervous%20system/nervous1.htm
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