Cnidarians
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Transcript of Cnidarians
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CnidariansSandra Benito J.H., 9B
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Facts
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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
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Characteristics
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Found in marine environments.Two basic body types:
PolypsMedusae
TentaclesVenomous cell organelles (cnidea)Gastrovascular cavityThree-layered body; epidermis, mesoglea and gastrodermisRadially symmetricCarnivorousSolitary or colonialAsexual and/or sexual reproductionNervous systemNo cardiovascular system
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History
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Fossil history:• Vendian/ Ediacaran period
• 650 to 540 million years
ago
• Soft-bodied organisms
•Cambrian period - coral fossils
•Early Ordovician - more
developed corals
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Generalized Life CycleAnd Life Expectancy
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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 tissueMatured medusae swim awaySexual cells releasedEggs are fertilizedZygote/planula settles and develops into a polyop
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Digestive System
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Absorb dissolved organic chemicals
Filter food particles
Nutrients from endosymbiotic algae
Predate
Crustaceans and plankton
Medusae forms sink on top of the prey
Gastrodem layer releases enzymes that kill
the prey
Cells absorb the nutrients
Nutrients spread by diffusion or mobile
cells
Indigestible remnants are ejected
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Respiratory andCirculatory System
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No circulatory systemNo respiratory organs
Absorb/expel O and CO2 into water
Water in digestive cavity is expelled
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Sensory System
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Simple sensory systemNet of nerves made of
sensitive neuronsSensitive neurons are
connected by chemical synapse
Neuron sends neurotransmitter (chemical) to cell group
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BibliographyNew Oxford American Dictionaryhttp://en.wikipedia.org/wiki/Cnidariahttp://waynesword.palomar.edu/trnov01.htm#animalshttp://www.buzzle.com/articles/jellyfish-facts-for-kids.htmlhttp://animals.about.com/od/cnidarians/p/cnidaria.htmhttp://nationalzoo.si.edu/Animals/Invertebrates/Facts/cnidarians/default.cfmhttp://www.oceaninn.com/the-nature-preserve/cnidarians/http://mapress.com/zootaxa/2011/f/zt03148p012.pdfhttp://animals.about.com/od/cnidarians/ss/cnidarians.htmhttp://www.ucmp.berkeley.edu/cnidaria/cnidariafr.htmlhttp://www.angelfire.com/moon2/asciencems/http://zoology.muohio.edu/crist/Zoo312/Cnidaria.htmlhttp://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20102/bio
%20102%20lectures/nervous%20system/nervous1.htm