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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 Ocelli- simply sensory organ Two-way digestion- food enters and leaves same cavity Hydrostatic Skeleton- muscle changes with liquid 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 Digestion Two way Digestion Mouth also anus Gastrovascular cavity digests and distributes food Waste pushed out mouth Tentacles aid in releasing waste Respiration Breath through diffusion Oxygen obtained through water Diffuses oxygen higher to lower concentration Diffuses in gastrovascular cavity Possible through thin cell layers 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 Excretion Gaseous wastes eliminated by diffusion Dissolved wastes leave through diffusion Waste created in gastrovascular cavity Undissolved waste leaves through anus Waste is taken in and leaves through mouth Response Nematocyst defends animal Nerve nets aid in response Ocelli Does not have brain or eyes Nematocyst located all over Movement Hydrostatic skeleton Moves with muscle contractions Shape changes depending on fluid Without liquids there is no movement Expelling liquids propels movement 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 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 Facts 10,000 different species 130 species in Sydney Harbor Only two are dangerous to humans Comes from Greek cnidos or stinging nettle Have no developed organs 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-exoskeletonand-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:ANd9GcRAIwYYk21MD6R0MTzEXMwq2mdbzM18Af9Dc6sxswrWOb1mODMsQ 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