Irregularia

== Translingual == === Etymology === Latin irrēgulāris (“irregular”) +‎ -ia (abstract suffix). === Proper noun === Irregularia A taxonomic infraclass within the class Echinoidea – certain sea urchins. ==== Hypernyms ==== (infraclass): Eukaryota – superkingdom; Animalia – kingdom; Bilateria – subkingdom; Deuterostomia – infrakingdom; Deuterostomia – superphylum; Echinodermata – phylum; Echinozoa – subphylum; Echinoidea – class; Euechinoidea - subclass ==== Hyponyms ==== (infraclass): Cassiduloida, Clypeasteroida (sand dollars), Echinolampadoida, Holasteroida, Spatangoida (heart urchins) - orders ==== Coordinate terms ==== (infraclass in Euechinoida): Carinacea, Acroechinoidea - infraclasses; Echinothurioida - order not placed in infraclass === References === Euechinoidea on Wikipedia.Wikipedia Irregularia on Wikispecies.Wikispecies Category:Irregularia on Wikimedia Commons.Wikimedia Commons Ruggiero MA, Gordon DP, Orrell TM, Bailly N, Bourgoin T, Brusca RC, et al. (2015) A Higher Level Classification of All Living Organisms. PLoS ONE 10(4): e0119248. PMID 25923521, →DOI