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An Introduction to Zoology: Chapter 11
An Introduction to Zoology: Chapter 11
Published by The Lone Ranger
12-23-2008
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An Introduction to Zoology

Chapter 11: The Bilateria: Acoelomate Lophotrochozoans:


The Bilateria:
In the two previous chapters, we discussed the phyla Cnidaria and Ctenophora, the diploblastic, radially-symmetrical animals that are collectively known as the Radiata. All other animals are triploblastic and bilaterally symmetrical, and so are collectively known as the Bilateria.

All of the Bilateria have elongated, bilaterally-symmetrical bodies, at least during the embryo stage. Some of the Bilateria are radially-symmetrical as adults, its true, but all of them develop from bilaterally-symmetrical embryos. Most of the Bilateria also show some degree of cephalization, meaning that their sense organs are concentrated at the anterior end to form a head.



Almost all of the Bilateria have their sense organs and neural tissues
concentrated at the anterior end of the body. This concentration of sensory
and neural tissues at the anterior end of the body is known as cephalization.


The remaining articles in this series will focus on the various phyla within the clade Bilateria. First, though, well briefly discuss bilaterian classification and diversity.



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Thanks, from:
cappuccino (12-23-2008), Ensign Steve (12-23-2008), Farren (12-23-2008)
  #1  
By cappuccino on 12-23-2008, 04:01 AM
Default Re: An Introduction to Zoology: Chapter 11

:shudder: What are the symptoms of a liver fluke infection? I like sushi and has eaten plenty in my life. They were cooked though, or so I thought.
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  #2  
By The Lone Ranger on 12-23-2008, 04:10 AM
Default Re: An Introduction to Zoology: Chapter 11

Wow! I haven't even finished editing the article into its final form yet!

If you had a liver fluke infection, you'd probably know it. Symptoms include pain in the abdomen, fever, vomiting, and diarrhea.

Cheers,

Michael
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