Cnidarian

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cklee
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Cnidarian

Post by cklee » Thu Dec 08, 2005 7:57 pm

how is the bilateral symmetry of an echinoderm different from that of a cnidarian?

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MrMistery
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Post by MrMistery » Fri Dec 09, 2005 6:52 pm

Don't echinoderms have radiar symmetry?
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February Beetle
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Post by February Beetle » Sat Dec 10, 2005 3:33 pm

Echinoderms have bilateral symmetry as larva but radial as adults. And... I believe Cnidarians have radial symmetry all the time because they have no true tissue layers or anything and if you look at the body structure you can cut it anyway. It is like a body mass with a cavity inside. Flatworms are supposed to be the "first" time you see bilateral symmetry evolution wise in Kingdom Animelia, which, "complex" wise comes right after Cnidaria because of bilateral symmetry (and other things)
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Post by flint » Thu Dec 15, 2005 3:29 am

Echinoderms don't have true radial symmetry as adults, they have 5-part radial symmetry.

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