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Cnidaria (jellyfish/squishy and corals and anemones). Matthew, Dohn , Tuckah. Cnidaria!!!!. Includes hydras, corals, jellies, and anenomes All have cnidocytes. http://z.about.com/d/animals/1/0/J/U/cnidarian1.jpg. Tucker Chambers.

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cnidaria
Cnidaria!!!!
  • Includes hydras, corals, jellies, and anenomes
  • All have cnidocytes

http://z.about.com/d/animals/1/0/J/U/cnidarian1.jpg

Tucker Chambers

http://www.wrobelphoto.com/GelatinousZooplankton/Hydromedusae/Popup189.jpg

some quick basics
Some quick basics
  • are sessile or floating
  • Have two forms—polyp and medusa

http://biology.unm.edu/ccouncil/Biology_203/Images/SimpleAnimals/cnidariaDiagram.jpeg

Tucker Chambers

slide4

Scyphozoans

  • Jellies
  • Live mostly as medusae

http://www.afrmc.org/images/jellyfish.jpg

Tucker Chambers

http://lesleehorner.files.wordpress.com/2009/12/jellyfish2.jpg

anthozoans
Anthozoans
  • Sea anemones and coral
  • Live only as polyps (sessile)

http://library.thinkquest.org/07aug/01713/images/Brain_coral.jpg

http://library.thinkquest.org/05aug/01819/Images/Sea%20Anemone.jpg

http://www.treehugger.com/dying-coral-frozen.jpg

Tucker Chambers

http://epaper.kek.jp/f05/PHOTOS/5_TOURS/5_004.JPG

hydrozoans
Hydrozoans
  • Very simple
  • Found in fresh water
  • Alternate between polyp and medusa stage

http://www.ucmp.berkeley.edu/cnidaria/hydra1.gif

Tucker Chambers

http://library.thinkquest.org/26153/marine/sketch/600.jpg

cubazoan s
Cubazoan's
  • “Box Jellies” or “Sea Wasps”
  • Have complex eyes along edge of medusae

http://www.zoologie-online.de/Systematik/Metazoa/Cnidaria/Cubozoa/Carybdea.jpg

Tucker Chambers

http://www.jyi.org/articleimages/189/originals/img0.jpg

body cavity
Body Cavity
  • Acoelomates

Tucker Chambers

http://biology.unm.edu/ccouncil/Biology_203/Images/SimpleAnimals/cnidariaDiagram.jpeg

body symmetry
Body Symmetry
  • Radial Symmetry

Tucker Chambers

http://www.dnr.sc.gov/marine/pub/seascience/images/undrview.gif

circulatory system
Circulatory System
  • None! 

Dory: I spy something pink and squishy that lacks a circulatory system!

Marlin: Let me guess… a Cnidarian!

http://www.the-reel-mccoy.com/movies/2003/images/FindingNemo3.jpg

Matt Maneval

digestive system
Digestive System
  • Digestive or gastrovascular cavity open at one end.
  • Captures animals with nematocysts on tentacles.

http://www.advancedaquarist.com/2007/2/fish_album/polyp.jpg

Matt Maneval

excretory system
Excretory System
  • None.

Dory: They don’t have excretory systems? Gross.

Marlin: That’s just wrong.

http://www.bfi.org.uk/features/ultimatefilm/chart/images/185/56_finding_nemo.jpg

Matt Maneval

locomotion musculature
Locomotion/Musculature
  • Medusaeswimbyundulations of thebell body.
  • Polyps are sessile.

http://www.infoplease.com/images/ESCI294CNIDAR007.jpg

Matt Maneval

reproductive cycles
Hydrozans reproduce sexually in poor conditions by making resistant zygotes that remain dormant until conditions improve.Reproductive Cycles
  • Hydrozans reproduce asexually by budding, the pinching off of outgrowths, when conditions are favorable.

Dan McKinney

sensory structures
A Box Jellyfish

http://www.ntnews.com.au/article/2008/12/13/21641_ntnews.html

Sensory Structures
  • Most Cnidaria have simple sensory structues distributed throughout their bodies.
  • Some, such as Cubazoans, have complex eyes embedded on the tips of their tentacles for catching prey.

Dan McKinney

skeletal system
Skeletal System
  • Cnidaria's lack bone structure. Most are supported by water swelling in their digestive cavity or water filled cells.
  • Coral secretes calcium carbonate exoskeletons, which when dead form coral reefs.

http://www.bloodydecks.com/forums/northern-california-inshore-offshore-reports/147737-ft-bragg.html

gas exchange
Gas Exchange
  • Cnidarian species exchange gas through simple diffusion in and out of the cells.

Dan McKinney

http://www.aloha.com/~lifeguards/chironexfleckeri.jpg

special powers
Special “Powers”
  • Cnidarians use poisonous tentacles to capture and kill their prey. These are called nematocysts.
  • The Box Jelly Fish is so poisonous that one sting has enough venom to kill 60 men.

http://lifeinthefastlane.com/2008/12/box-jellyfish-chironex-fleckeri/

Dan McKinney

question 1
Question 1
  • Do hydrozoans spend most of their life in
  • Polyp
  • Medusa
  • Alternate between life cycles

Matt Maneval

slide20
Correct Answer: C. Hydrozoans alternate between polyp and medusa throughout their life.

Matt Maneval

question 2
Question 2
  • How do hydrozoans reproduce?
  • Sexually
  • Asexually
  • Sexually and Asexually, depending on conditions.

Matt Maneval

slide22
Correct Answer: C. Hydrozoans reproduce sexually and asexually, depending on the conditions.

Matt Maneval

http://animaldiversity.ummz.umich.edu/site/resources/Grzimek_inverts/Hydrozoa/v01_id118_con_hydanat.jpg/medium.jpg

question 3
Question 3
  • What classification do Sea Anemones fall under?
  • Anthozoans
  • Scyphozoans
  • Hydrozoans
  • Cubozoans

Dan McKinney

question 4
Question 4

Which of these are only sessile?

  • Anthozoans
  • Hydrozoans
  • Scyphozoans
  • Cubozoans

Dan McKinney

slide26
Correct Answer: A, Anthozoans are only sessile.

http://www.anthozoa.com/Photos/Welcome/Anthozoans.jpg

Dan McKinney