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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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cnidaria

Cnidaria

Hydras, anemones, jellyfish, corals

key characteristics
Key Characteristics
  • Lives both in salt and fresh water
  • Simple nervous system’
  • Stinging cells
  • Radial Symmetry
  • Two embryonic cell layers
anatomy
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
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
Digestion
  • Two way Digestion
  • Mouth also anus
  • Gastrovascular cavity digests and distributes food
  • Waste pushed out mouth
  • Tentacles aid in releasing waste
respiration
Respiration
  • Breath through diffusion
  • Oxygen obtained through water
  • Diffuses oxygen higher to lower concentration
  • Diffuses in gastrovascularcavity
  • Possible through thin cell layers
internal transport
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
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
response
Response
  • Nematocyst defends animal
  • Nerve nets aid in response
  • Ocelli
  • Does not have brain or eyes
  • Nematocyst located all over
movement
Movement
  • Hydrostatic skeleton
  • Moves with muscle contractions
  • Shape changes depending on fluid
  • Without liquids there is no movement
  • Expelling liquids propels movement
reproduction
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
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
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
works cited
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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