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An Introduction to Zoology: Chapter 9
An Introduction to Zoology: Chapter 9
Published by The Lone Ranger
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An Introduction to Zoology

Chapter Nine: The Radiata: Phylum Cnidaria:

The Eumetazoans:
The eumetazoans, as you recall, are the “true animals.” Unlike the parazoans, eumetazoan animals possess true tissues, and most of them have organs as well. Also unlike the parazoans, all of the eumetazoans have some degree of body symmetry, and all eumetazoans undergo embryonic development.

Another thing that distinguishes the eumetazoans is that most of them have two types of tissues that are found in no other living organisms. These tissue types that are unique to eumetazoan animals are neural (nervous) tissue and muscular tissue. In most eumetazoans, muscle tissue is attached to some sort of supportive skeleton – either an internal endoskeleton or an external exoskeleton.


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Thanks, from:
Ensign Steve (12-13-2008)

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