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Thesaurus: paleechinoidea

An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini.

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  1. n. pl. An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini.
  2. An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palæechini. [Written also Palæechinoidea.]
  3. An extinct order of sea urchins found in the Paleozoic rocks.They had more than twenty vertical rows of plates. Called alsoPalæechini. [Written also Palæechinoidea.]