The available fossil record denotes an accumulation of class-level diversity during the Ordovician Biodiversification Event [ 3 , 6 ], with many orders and families represented in the Carboniferous [ 2 ]—an overall trend that broadly aligns with the results of molecular analyses [ 7 ].
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The Cambrian cirratuliform <i>Iotuba</i> denotes an early annelid radiation.
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