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

Some quick basics

• are sessile or floating• Have two forms—polyp

and medusa

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

Scyphozoans• Jellies• Live mostly as medusae

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

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

Tucker Chambers

Anthozoans

• Sea anemones and coral

• Live only as polyps (sessile)

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

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

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

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

Hydrozoans• Very simple• Found in fresh water • Alternate between polyp

and medusa stage

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

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

Tucker Chambers

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

http://www.jyi.org/articleimages/189/originals/img0.jpgTucker Chambers

Body Cavity

• Acoelomates

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

Tucker Chambers

Body Symmetry

• Radial Symmetry

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

Circulatory System

• None!

Matt Maneval

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

Digestive System

• Digestive or gastrovascular cavity open at one end.

• Captures animals with nematocysts on tentacles.

Matt Manevalhttp://www.advancedaquarist.com/2007/2/fish_album/polyp.jpg

Excretory System

• None.

Matt Maneval

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

Locomotion/Musculature

• Medusae swim by undulations of the bell body.

• Polyps are sessile.

Matt Manevalhttp://www.infoplease.com/images/ESCI294CNIDAR007.jpg

Reproductive Cycles Hydrozans reproduce

asexually by budding, the pinching off of outgrowths, when conditions are favorable.

Hydrozans reproduce sexually in poor conditions by making resistant zygotes that remain dormant until conditions improve.

Dan McKinney

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.

• A Box Jellyfish• http://www.ntnews.com.au/article/2008/12/13/21641_ntnews.html

Dan McKinney

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

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

Dan McKinneyhttp://www.aloha.com/~lifeguards/chironexfleckeri.jpg

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

• Do hydrozoans spend most of their life ina)Polypb)Medusac) Alternate between life cycles

Matt Maneval

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

Matt Maneval

Question 2

• How do hydrozoans reproduce? a)Sexuallyb)Asexuallyc) Sexually and Asexually, depending on

conditions.

Matt Maneval

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

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

Question 3

• What classification do Sea Anemones fall under?

a)Anthozoansb)Scyphozoansc) Hydrozoansd)Cubozoans

Dan McKinney

• Correct Answer: A, Anthozoans

Matt Maneval

Which of these are only sessile?a)Anthozoansb)Hydrozoansc) Scyphozoansd)Cubozoans

Dan McKinney

Question 4

Correct Answer: A, Anthozoans are only sessile.

Dan McKinney

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