CNIDARIANS
Hannah McMichael
Zoe Martin
BODY SYMMETRY
 Radial Symmetry
Johnson, George B. "Symmetry and Segmentation."
Https://online.science.psu.edu/biol011. N.p., n.d. Web
MOVEMENT
Two types of Cnidarians
Polyps
Medusa
Polyps are sessile
Not moving
Medusa have a hydra static skeleton
Fluid filled cavity surrounding muscles
"Cnidarians Movement." Www.oceanicresearch.org/education/wonders/cnidarian.org.
N.p., n.d. Web
NERVOUS SYSTEM
Present
No brains
Use stinging cells called nematocysts
Nerve Nets
Sensory neurons react to different stimuli
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando: Holt,
Rinehart and Winston, 2006. Print.
DIGESTIVE SYSTEM
Two way system
Mouth and Anus
Same opening
Break down food in the gastrovascular activity
Absorbs nutrients
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando:
Holt, Rinehart and Winston, 2006. Print.
EXCRETORY SYSTEM
Diffusion / Osmosis
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando:
Holt, Rinehart and Winston, 2006. Print.
CIRCULATORY SYSTEM
Diffusion / Osmosis
Postlethwait, John H., and Janet L. Hopson. Modern Biology.
Orlando: Holt, Rinehart and Winston, 2006. Print.
RESPIRATORY SYSTEM
Diffusion / Osmosis
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando:
Holt, Rinehart and Winston, 2006. Print.
SUPPORT OR SKELETON SYSTEM
Hydra Static Skeleton
Fluid filled cavity surrounded by muscles
Http://biomania.weebly.com/f5_chapter2.html. N.p., n.d. Web.
REPRODUCTIVE SYSTEM
Polyp
Asexual-budding
Medusa
Sexual
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando: Holt, Rinehart and
Winston, 2006. Print.
Http://www.microscopy-uk.org.uk/micropolitan/marine/invertebrates/. N.p., n.d. Web.
HYRDROZOA
Sessile- not moving
Examples:
Hydra
Fire coral
Velella
"Fire Coral." Http://www.lindapitkin.net/large/Pink_fire_coral_L2447_12_Baa.html. N.p., n.d. Web.
"Hydra." Http://racehorse.myblog.it/2011/11/07/hydra-cnidaria/. N.p., n.d. Web.
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando: Holt, Rinehart and Winston, 2006. Print.
"Velella." Http://www.newsouthernview.com/pages/nsv_ta_jellies.html. N.p., n.d. Web.
SCYPHOZOA
Sessile- not moving
Example:
Jelly
Periphylla
Zhizostoma
"Natural History Museum." Http://www.nhm.ac.uk/about-us/we-are-redeveloping-our-website.html. N.p., n.d. Web.
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando: Holt, Rinehart and Winston, 2006. Print.
"Zhizostoma." Http://www.diveitaly.com/a_biblioteca/phgal/atosi/rhizostoma.htm. N.p., n.d. Web.
ANTHOZOA
Sessile- Not moving
Example:
Sea anemones
Coral
Sea fans
Coral." Http://www.flickr.com/photos/russheath/2363609532/. N.p., n.d. Web.
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando: Holt, Rinehart and Winston, 2006. Print.
"Sea Fan." Http://flickr.com/photos/berniedup/6096812367. N.p., n.d. Web
Http://www.slac.stanford.edu/econf/C0508213/PHOTOS/5_TOURS/index.htm. N.p., n.d. Web.
“STINGING-CELLED” ANIMALS
They Sting prey with their Nematocysts
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando: Holt,
Rinehart and Winston, 2006. Print.
PURPOSE OF TENTACLES
They have stinging cells in their tips
Capture and subdue prey
"Cnidarians." Cnidarians. N.p., n.d. Web. 01 Oct. 2015.
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando:
Holt, Rinehart and Winston, 2006. Print.
PURPOSE OF NEMATOCYSTS
Coiled thread
Used to sting prey
"Nematocysts." Featuring Jellyfish Other Gelatinous Zooplankton. N.p., n.d.
Web. 01 Oct. 2015
Postlethwait, John H., and Janet L. Hopson. Modern Biology. Orlando: Holt,
Rinehart and Winston, 2006. Print.
HABITAT
Fresh or salt water
"World's Largest Oceanarium Opens at Resorts World Sentosa | SENATUS Magazine." SENATUS. N.p., n.d. Web. 01 Oct. 2015.
Freshwater Habitat." Http://pas.dpi.nsw.gov.au/Species/Species_Profile.aspx?SpeciesListingID=3. N.p., n.d. Web. 1 Oct. 2015
JELLYFISH
Massachusetts Academy of Sciences Blogline." Massachusetts Academy of Sciences Blogline.
N.p., n.d. Web. 01 Oct. 2015.
SEA ANEMONE
"Sea Anemone and the Clowmnfish." Http://coglab.hbcse.tifr.res.in/teacherresources/multimedia-resources/symbiosis/sea-anemone-and-the-clownfish. Small Science, n.d.
Web.
HYDRA
"Hydra-cnidaria." Http://imgarcade.com/1/cnidaria-hydra/. N.p., n.d. Web.
CORAL
Mrs. Redingar cnidarian shelf
POLYP
MEDUSA
"Aquatic Animals." Government of Canada, Fisheries and Oceans
Canada, Communications Branch. N.p., n.d. Web. 01 Oct. 2015
POLYP VS. MEDUSA
Sponges & Cnidarian Notes B1." Sponges & Cnidarian Notes B1.
N.p., n.d. Web. 01 Oct. 2015.