The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals...
-
Upload
mabel-shelton -
Category
Documents
-
view
215 -
download
1
Transcript of The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals...
![Page 1: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/1.jpg)
The Jellyfish
• Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes
• All animals except sponges
– Belong to the clade Eumetazoa, the animals with true tissues
• Phylum Cnidaria
– Is one of the oldest groups in this clade
![Page 2: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/2.jpg)
• Cnidarians
– Have diversified into a wide range of both sessile and floating forms including jellies, corals, and hydras
– But still exhibit a relatively simple diploblastic, radial body plan
![Page 3: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/3.jpg)
• The basic body plan of a cnidarian
– Is a sac with a central digestive compartment, the gastrovascular cavity
– There are two types of body
• The polyp, a sessile attached form and
• Medusa, a free floating active form
• A single opening
– Functions as both mouth and anus
![Page 4: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/4.jpg)
http://webs.lander.edu/rsfox/invertebrates/hydra.html
Anatomy of a polyp
![Page 5: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/5.jpg)
Anatomy of a medusa
http://webs.lander.edu/rsfox/invertebrates/aurelia.html
![Page 6: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/6.jpg)
• Cnidarians are carnivores
– That use tentacles to capture prey
• The tentacles are armed with cnidocytes
– Unique cells that function in defense and the capture of prey
http://www.tarleton.edu/~biology/pfau/BIOL1214/lectures/2acoelomates/cnidarians.htm
![Page 7: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/7.jpg)
A cnidocyte of a hydra
Tentacle
“Trigger”
Nematocyst
Coiled thread
DischargeOf thread
Cnidocyte
Prey
Campbell & Reece, Biology, 7th Ed., Pearson
![Page 8: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/8.jpg)
Scyphozoans
• In the class Scyphozoa
– Jellies (medusae) are the prevalent form of the life cycle
• In the class Cubozoa, which includes box jellies and sea wasps
– The medusa is box-shaped and has complex eyes
• Class Anthozoa includes the corals and sea anemones
– Which occur only as polyps
![Page 9: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/9.jpg)
Physalia
Hydrozoa
![Page 10: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/10.jpg)
float
tentacles
Digestive polyps
Reproductive polyps
![Page 11: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/11.jpg)
Vellela vellela (By the Wind Sailor)
http://www.flickr.com/photos/nativeagle/101348346/in/photostream/
![Page 12: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/12.jpg)
Hydrozoa
http://animaldiversity.ummz.umich.edu/site/accounts/pictures/Hydrozoa.html
![Page 14: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/14.jpg)
![Page 15: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/15.jpg)
Class - Cubozoa Box Jellies
![Page 16: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/16.jpg)
Hydrozoans
• Most hydrozoans
– Alternate between polyp and medusa forms
http://orion1.paisley.ac.uk/courses/Tatner/biomedia/pictures/hydro.htm
![Page 17: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/17.jpg)
An animal that eats jellyfish, the Sunfish
![Page 18: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/18.jpg)
![Page 19: The Jellyfish Cnidarians have radial symmetry, a gastrovascular cavity, and cnidocytes All animals except sponges – Belong to the clade Eumetazoa, the.](https://reader030.fdocuments.in/reader030/viewer/2022032722/56649f4d5503460f94c6e306/html5/thumbnails/19.jpg)
http://www.earthwindow.com/mola.html#