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Cnidaria. Hydras, anemones, jellyfish, corals. Key Characteristics. Lives both in salt and fresh water Simple nervous system’ Stinging cells Radial Symmetry Two embryonic cell layers . Anatomy. Nerve net- areas densely pact with nerve cells Statocyst - an organ for movement

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  1. Cnidaria Hydras, anemones, jellyfish, corals

  2. Key Characteristics • Lives both in salt and fresh water • Simple nervous system’ • Stinging cells • Radial Symmetry • Two embryonic cell layers

  3. Anatomy • Nerve net- areas densely pact with nerve cells • Statocyst- an organ for movement • Ocelli- simply sensory organ • Two-way digestion- food enters and leaves same cavity • Hydrostatic Skeleton- muscle changes with liquid

  4. Anatomy cont. • Tentacle- surrounds mouth to aid food captures • Nematocyst- Harpoon like stinging cells • Mouth- takes in food and removes waste • Gastrovascular cavity- distributes digested nutrients • Bud- group of cells that grows into new organism

  5. Digestion • Two way Digestion • Mouth also anus • Gastrovascular cavity digests and distributes food • Waste pushed out mouth • Tentacles aid in releasing waste

  6. Respiration • Breath through diffusion • Oxygen obtained through water • Diffuses oxygen higher to lower concentration • Diffuses in gastrovascularcavity • Possible through thin cell layers

  7. Internal Transport • Gastrovascular cavity breaks down particles • Cells surrounding cavity absorb • Nutrients distributed by cells • Thin cells create semipermeable body • Unused particles leave through anus

  8. Excretion • Gaseous wastes eliminated by diffusion • Dissolved wastes leave through diffusion • Waste created in gastrovascularcavity • Undissolved waste leaves through anus • Waste is taken in and leaves through mouth

  9. Response • Nematocyst defends animal • Nerve nets aid in response • Ocelli • Does not have brain or eyes • Nematocyst located all over

  10. Movement • Hydrostatic skeleton • Moves with muscle contractions • Shape changes depending on fluid • Without liquids there is no movement • Expelling liquids propels movement

  11. Reproduction • Both asexual and sexual reproduction • Budding creates genetic clone • Sperm and eggs are released in water • Combined in water create zygote • Zygote settles and grows into adult polyp

  12. Examples • Cubozoa- box jellyfish • Scyphozoa- moon and purple jellyfish • Anthozoa- anemone, coral • Hydrozoa- hydra, Portuguese man of war • Divided into fresh and salt water groups

  13. Facts • 10,000 different species • 130 species in Sydney Harbor • Only two are dangerous to humans • Comes from Greek cnidosor stinging nettle • Have no developed organs

  14. Works Cited • http://classconnection.s3.amazonaws.com/556/flashcards/1811556/gif/cnidaria_hydra1365168401629.gif • http://library.thinkquest.org/28751/review/animals/2.html • http://www.vattenkikaren.gu.se/fakta/arter/cnidaria/overcnid/nass04e.html • http://www.ncbi.nlm.nih.gov/pubmed/7833621 • https://www.boundless.com/biology/the-musculoskeletal-system/types-of-skeletal-systems/hydrostatic-skeleton-exoskeleton-and-endoskeleton/ • http://www.angelfire.com/mo2/animals1/phylum/jellyfish.html • http://science.kennesaw.edu/~jdirnber/Bio2108/Lecture/LecBiodiversity/33_Labeled_Images/33_06HydraCnidocyte-L.jpg • http://upload.wikimedia.org/wikipedia/commons/3/32/Marrus_orthocanna_crop.jpg • https://encrypted-tbn0.gstatic.com/images?q=tbn:ANd9GcRAIwYYk21MD6R0-MTzEXMwq2mdbzM18Af9Dc6sxswrWOb1mODMsQ • http://cnidarianh.blogspot.com/2007/02/feeding-respiration-excretion.html • http://w3.shorecrest.org/~Lisa_Peck/MarineBio/syllabus/ch7invertebrates/Invertwp/invert_wp_05/cnidaria/miles1/Cool.htm • http://www.mesa.edu.au/cnidaria/images/jelly_life-cycle.jpg • https://lh4.googleusercontent.com/-nv2CohpE238/TYumw6y9wHI/AAAAAAAAJ-A/X-wIl_VNczQ/s1600/Picture%2B14.png • http://ichef.bbci.co.uk/naturelibrary/images/ic/credit/640x395/c/cn/cnidaria/cnidaria_1.jpg

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