http://soe.ucdavis.edu/ss0708/pimentela/images/Jellyfish.jpg

http://photography.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/Photography/Images/Content/transparent-jellyfish-689547-xl.jpg

Divided into 4 classes: › Hydrozoa

Obelia Some are Freshwater

› Scyphozoa Jellyfish

› Cubozoa Sea Wasp

› Anthozoa Sea Anemones

CHIKA

Polyps:› Cylindrical Form› Adhere to the ground on the aboral end› Not free moving

Medusa:› Flattened, mouth down version of polyp› Free moving

Michelle

http://images.google.com/imgres?imgurl=http://blog.hotelclub.com/wp-content/uploads/2008/05/jellyfish2.jpg&imgrefurl=http://blog.hotelclub.com/the-incredible-jellyfish-lake/&usg=__BKagMTz8g47-VG4SX8EDFaL9uoI=&h=300&w=400&sz=47&hl=en&start=145&um=1&itbs=1&tbnid=UmZgcZhcKfWCvM:&tbnh=93&tbnw=124&prev=/images%3Fq%3Djellyfish%26start%3D144%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1R2SNNT_enUS364%26ndsp%3D18%26tbs%3Disch:1

No coelom present› No open area surrounded by body tissue

Gastrovascular cavity› Digestive compartment

Makana

http://estb.msn.com/i/28/CE6ED47A2567BD0E2F316AE1291B4.jpg

Radial Symmetry› Radiate from center› Any plane will cut into mirror images

Chika

http://www.biology-blog.com/images/blogs/11-2007/new-species-of-sea-anemone.jpg

Non-centralized nerve net that coordinates movement

No brain

Michelle

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

None :[

Makana

http://images.google.com/imgres?imgurl=http://blog.hotelclub.com/wp-content/uploads/2008/05/jellyfish2.jpg&imgrefurl=http://blog.hotelclub.com/the-incredible-jellyfish-lake/&usg=__BKagMTz8g47-VG4SX8EDFaL9uoI=&h=300&w=400&sz=47&hl=en&start=145&um=1&itbs=1&tbnid=UmZgcZhcKfWCvM:&tbnh=93&tbnw=124&prev=/images%3Fq%3Djellyfish%26start%3D144%26um%3D1%26hl%3Den%26sa%3DN%26rlz%3D1R2SNNT_enUS364%26ndsp%3D18%26tbs%3Disch:1

Pushes food into cavity using tentacles› Use of cnidocytes and nematocyst

Food comes through mouth/anus No real, developed digestive system

Chika

http://static.howstuffworks.com/gif/jellyfish-9.jpg

No real, developed excretory system Undigested remains are pushed out

through mouth/anus

http://www.psychobeing.co.uk/doblog/wp-content/uploads/2009/11/MakingJellyfishBabies1.jpg

Michelle

Polyps are stationary Medusae move by passive drifting and

contractions of its bell-shaped body Cubozoans actively pursue their prey

http://img.brothersoft.com/screenshots/softimage/c/coral_clock_3d_screensaver-45155-1228962634.jpeg

Makana

No bones The Gastrovascular Cavity acts as a

hydrostatic skeleton› When the volume of the cavity is filled, it

can change shape

http://www.aquadirectory.us/wp-content/uploads/Glow%20Coral%20Fish.jpg

Chika

Simple contractile tissues that can detect and respond to stimuli equally from all directions

Some Cubozoans have complex eyes embedded in their medusa

http://www.nature.com/nature/journal/v440/n7082/images/440280a-i1.0.jpg

Makana

Hydrozoan Reproduction

Asexual› Favorable

environmental conditions

› Budding and Pinching off

Sexual› Deteriorating

environmental conditions

› Resistant zygotes that remain dormant

http://www.biology.uco.edu/PersonalPages/CButler/BIO1404/slides/Slide_37_Obelia_(wm).jpg

Michelle

http://www.palaeos.com/Invertebrates/Cnidaria/Images/obelia_cycle.gif

Scyphozoans Reproduction

Dominant stage: medusa Coastal jellyfish

› Alternate generations› Sexual and Asexual Reproduction

Open Ocean jellyfish› No polyp stage› Sexual and Asexual Reproduction

http://graphics.stanford.edu/courses/cs348b-competition/cs348b-03/jellyfish/Jellyfish.jpg

Michelle

Cubozoans Reproduction

Dominant Stage: Medusa (box-shaped) Alternate generations Asexual Reproduction Sexual Reproduction

http://images.google.com/imgres?imgurl=http://i248.photobucket.com/albums/gg165/vampix3/jellyfish.jpg&imgrefurl=http://www.myspace.com/33046871&usg=__NjTiLWiwVVdMz0zEFclRlye3884=&h=375&w=500&sz=60&hl=en&start=70&um=1&itbs=1&tbnid=L3wlsiNuLq0GDM:&tbnh=98&tbnw=130&prev=/images%3Fq%3Djellyfish%26start%3D60%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en-US%26ndsp%3D20%26tbs%3Disch:1

Michelle

Anthozoans Reproduction

Dominant stage: polyp No medusa stage Asexual Reproduction Sexual Reproduction

http://images.google.com/imgres?imgurl=http://i248.photobucket.com/albums/gg165/vampix3/jellyfish.jpg&imgrefurl=http://www.myspace.com/33046871&usg=__NjTiLWiwVVdMz0zEFclRlye3884=&h=375&w=500&sz=60&hl=en&start=70&um=1&itbs=1&tbnid=L3wlsiNuLq0GDM:&tbnh=98&tbnw=130&prev=/images%3Fq%3Djellyfish%26start%3D60%26um%3D1%26hl%3Den%26sa%3DN%26rls%3Dcom.microsoft:en-US%26ndsp%3D20%26tbs%3Disch:1

Michelle

Lack specialized organs for gas exchange

Take in gases directly from surrounding water

http://farm1.static.flickr.com/23/33904224_771803aeb7.jpg

Makana

Sea Wasps› One contains enough poison to kill 60

people

http://www.zmescience.com/wp-content/uploads/2009/08/sea-wasp.jpg

Chika

Ctenophora

Also known as Comb Jellies 8 “combs” of cilia that propel it through

the water To catch prey:

› If prey touches one of the two tentacles, specialized cells burst open

› Covers the prey with a sticky mass

http://people.bu.edu/jrf3/BI547/IMAGE_CTENOPHORA_Mnemiopsis.jpg

Makana

Quiz Questions!

Which of the following is present in Cnidarians?› A circulatory system› A nervous system› A developed digestive system› None of the above

Answer: None of the above

http://thundafunda.com/33/underwater-animals-fish/Drifters,%20Jellyfish%20pictures%20underwater%20photos.jpg

Chika

Quiz Questions!

Which of the following animals is a Cnidarian?› Octopus› Sea Star› Sea Anemone› Clam

Answer: Sea Anemone

http://www.biocrawler.com/w/images/f/fe/Obelia-Hydrozoa-at40x.jpg

Makana

Quiz Questions!

What type of body symmetry do Cnidarians have?› Radial Symmetry› Bilateral Symmetry› Spherical Symmetry› Asymmetric

Answer: Radial Symmetry

http://www.valdosta.edu/~jlgoble/tclown1.jpg

Chika

Quiz Questions!

Which of the following are not one of the major classes of the phylum Cnidaria?› Scyphozoa› Cubozoa› Cephalopods› Anthozoa› Hydrozoa

Answer: Cephalopodshttp://funscubadiver.com/gallery/bonaire-scuba-photo/bonaire-flower-coral.jpg

Makana