What are echinoderms?

What are echinoderms? Here are some definitions.

Noun
  1. plural of echinoderm
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The water vascular system, found in all echinoderms, accommodates the elongated body of the holothurians.
We chordates are deuterostomes, as are echinoderms, some marine worms called hemichordates, and the urochordates, or sea squirts.
Others have maintained that the earliest brachiate echinoderms had only three arms.
The calcitic ossicles of crinoids, as is typical of echinoderms, form an internal skeleton that provides support and protection.
Most radially symmetric animals are sessile, however, echinoderms are able to move.
However, the placement of the ophiuroid branch with respect to the other echinoderms is still unresolved.

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