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The Eocrinoidea were an extinct class of echinoderms that lived between the Early Cambrian and Late Silurian periods. They are the earliest known group of stalked, brachiole-bearing echinoderms, and were the most common echinoderms during the Cambrian.
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early echinoderms cambrian earliest plates relationships eocrinoid class group eocrinidae groups holdfast blastozoan extinct lived late silurian periods known stalked
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