Diadematacea

== Translingual == === Etymology === (This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.) === Proper noun === Diadematacea A taxonomic superorder within the class Echinoidea – many sea urchins. ==== Hyponyms ==== (superorder): Diadematoida, Echinothurioida, Pedinoida - orders === References === Diadematacea on Wikipedia.Wikipedia Diadematacea on Wikispecies.Wikispecies Category:Echinoidea on Wikimedia Commons.Wikimedia Commons