Cnidaria
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Transcript of Cnidaria
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