Samantha Ferroni Mr. Collins Biology Period 4

1. Samantha Ferroni
Biology
4th Period

2. What Are Cnidarians?
 A Cnidarian is a
soft-bodied animal
with stinging cells.
 Cnidarians are the
simplest animals to
have body
symmetry and
specialized tissues.

3. Body Plan
 Most cnidarians has 2 different looking cycles of
life:
 Polyp Medusa

4. Feeding
 Cnidarians pull their
prey into their gastro-
vascular cavitys.
 The gastrovascular
cavity is a digestive
chamber with one
opening.
 Digestion takes place
outside the cells!

5. Groups of Cnidarians
 Cnidarians include jellyfish, hydras, sea
anemones and corals.
 All Cnidarians move differently, but they all
have hydrostatic skeletons. It allows the
muscles to move together so the cnidarians
can glide through water.

6. Bibliography
 "Common Jellyfish - Aurelia Aurita - Video 09d - ARKive." ARKive - Discover the World's Most
Endangered Species. Web. 31 Mar. 2010. <http://www.arkive.org/common-jellyfish/aurelia-
aurita/video-09d.html>.
 "Gastrovascular Cavity: Hydra." Washington State University - Pullman, Washington. Web. 31 Mar.
2010. <http://www.wsu.edu/~rlee/biol103/lect05/sld036.htm>.
 "Hawaii Health and Safety Guide." Hawaii Vacation Rentals - HawaiiGaga.com. Web. 31 Mar. 2010.
<http://www.hawaiigaga.com/HealthGuide.aspx>.
 "Introduction to Animals, Sponges, Cnidarians." Clinton Community College. Web. 31 Mar. 2010.
<http://faculty.clintoncc.suny.edu/faculty/michael.gregory/files/bio%20102/bio%20102%20lecture
s/Animal%20Diversity/Lower%20Invertebrates/sponges.htm>.
 Miller, Kenneth R., and Joseph S. Levine. Prentice Hall Biology. Upper Saddle River, N.J.: Prentice
Hall, 2002. Print.
 "Popular Entertainment Stories - Mixx." Mixx - Latest News and Top Videos and Photos from around
the Web. Web. 31 Mar. 2010. <http://www.mixx.com/entertainment>.
 "A Word About Polyps." The Fact Box. Web. 31 Mar. 2010.
<http://thefactbox.blogspot.com/2007/07/word-about-polyps.html>.
 "Purple Death | Palythoa | Rare Zoanthids." Zoanthids | Rare Zoanthids | Zoa Frags | Rare
Palythoa | Zoanthus | Zoas. Web. 31 Mar. 2010. http://www.rarezoanthids.com/purple-death/