cnidaria
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
CnidariaHydras, 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-ske
leton-exoskeleton-and-endoskeleton/ http://www.angelfire.com/mo2/animals1/phylum/jellyfish.html
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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/
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http://www.mesa.edu.au/cnidaria/images/jelly_life-cycle.jpg https://lh4.googleusercontent.com/-nv2CohpE238/TYumw6y9wHI/AAAAAAAAJ-A/X-wIl_VNczQ/s1600/Pictur
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