echinoderms bilateral or radial?

[gooperwooper]

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in class I learned they were bilateral but cliffs 3rd edition says they're radial -- thoughts?

 

[510586]

I believe they are bilateral when young (during embryo stage?) then radial as adults.

 

[Shadowwalker]

Echinoderms include sea stars, sea urchins, and sea cucumbers.
Echinoderms are RADICAL.
Echinoderms are Deutorosome, which its blastopore will eventually develop into an Anus instead of a mouth in Prostosome.
Echinoderms are classified into Chordata phylum.
All phylum Chordata has NOTOCHORD. There are some exceptions. Echinoderm is one of them. Echinoderm has no Notochord.
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Make sure you are clear with these information. it is very important.

 

[Stalkyyy]

Radial as adults, bilateral when young