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The name means "spined skin", from the greek. This invertabrate phylum have truly spiny (as in sea urchins amd sea stars) or apparently spiny (as in sea cucumbers) skin, are radially symetrical and are distinguished as being the only phylum except tardygrapsis that has no members that are parasitic. BTW: They have internal skeletons. They are not vertebrates. :)

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17y ago

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