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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



  • 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



  • 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



Fossil history:

  • Vendian/Ediacaran period

    • 650 to 540 million years ago

    • Soft-bodied organisms

  • Cambrian period - coral fossils

  • Early Ordovician - more developed corals


Generalized life cycle and life expectancy
Generalized Life CycleAnd Life Expectancy


  • 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



  • 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


Respiratory and circulatory system
Respiratory andCirculatory System


  • No circulatory system

  • No respiratoryorgans

    • Absorb/expel O and CO2 into water

    • Water in digestive cavity is expelled



  • 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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