ecdysozoan http://purl.obolibrary.org/obo/NCBITaxon_1206794 https://en.wikipedia.org/wiki/Category:Ecdysozoa https://en.wikipedia.org/wiki/Ecdysozoa https://eol.org/pages/8880788 https://species.wikimedia.org/wiki/Ecdysozoa https://www.wikidata.org/wiki/Q5176 A group of protostome animals, including Arthropoda (insects, chelicerata, crustaceans, and myriapods), Nematoda, and several smaller phyla. They were first defined by Aguinaldo et al. in 1997, based mainly on phylogenetic trees constructed using 18S ribosomal RNA genes. A large study in 2008 by Dunn et al. strongly supported the Ecdysozoa as a clade, that is, a group consisting of a common ancestor and all its descendants. Ecdysozoa ecdysozoans protostome