Download - Cnidaria
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CnidariaHydras, anemones, jellyfish, corals
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Key Characteristics Lives both in salt and fresh water
Simple nervous system’
Stinging cells
Radial Symmetry
Two embryonic cell layers
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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
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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
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Digestion Two way Digestion
Mouth also anus
Gastrovascular cavity digests and distributes food
Waste pushed out mouth
Tentacles aid in releasing waste
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Respiration Breath through diffusion
Oxygen obtained through water
Diffuses oxygen higher to lower concentration
Diffuses in gastrovascular cavity
Possible through thin cell layers
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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
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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
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Response Nematocyst defends animal
Nerve nets aid in response
Ocelli
Does not have brain or eyes
Nematocyst located all over
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Movement Hydrostatic skeleton
Moves with muscle contractions
Shape changes depending on fluid
Without liquids there is no movement
Expelling liquids propels movement
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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
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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
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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
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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-ske
leton-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-MTzEXMwq2mdbzM18Af9Dc
6sxswrWOb1mODMsQ
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/Pictur
e%2B14.png
http://ichef.bbci.co.uk/naturelibrary/images/ic/credit/640x395/c/cn/cnidaria/cnidaria_1.jpg