Lesson Summary
- Sponges are sessile filter feeders without true tissues.
- The cnidarians, such as jellyfish, are radially symmetrical with true tissues.
- Colonial cnidarians include the Portuguese man-of-war and corals.
Review Questions
- What is the only animal to lack true tissues?
- In what phylum are the sponges?
- How do sponges gain nutrition?
- Cnidarians are radially symmetrical. What does this mean?
- What are some examples of cnidarians?
- How do cnidarians sting their prey?
- Describe the nervous system of the cnidarians.
- How is a jellyfish different from a Portuguese man-o-war?
- How are coral reefs built?
- Where are most cnidarians found?
Further Reading / Supplemental Links
- http://www.ucmp.berkeley.edu/porifera/porifera.html
- http://animaldiversity.ummz.umich.edu
- http://www.pbs.org/kcet/shapeoflife/animals/cnidaria.html
- http://www.ucmp.berkeley.edu/cnidaria/cnidaria.htmlhttp://tolweb.org/tree?
group=Cnidaria&contgroup=Animalshttp://www.ucmp.berkeley.edu/cnidaria/
cnidaria.html - http://animaldiversity.ummz.umich.edu/site/accounts/information/Porifera.
html - http://en.wikipedia.org/wiki/Cnidaria
Vocabulary
corals Cnidarians that live on ocean reefs in colonies.
cnidarians Invertebrates that have radial symmetry and include the jellyfish.
filter feeders An organism that feeds by filtering organic matter out of water.
gastrovascular cavity A large cavity having both digestive and circulatory functions.