Ecdysozoa facts for kids

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Ecdysozoa
Temporal range: Lower Cambrian – Recent
Centipede
Scientific classification
Kingdom: Animalia
Subkingdom: Eumetazoa
Superphylum: Ecdysozoa
Aguinaldo et al., 1997
(unranked): Bilateria
Phyla

The Ecdysozoa (also called cycloneuralia) are a group of protostome animal phyla. This is a taxon above the level of phylum. It includes the Arthropoda (insects and crustaceans), Nematoda, and several smaller phyla.

They were first defined in 1997, based mainly on phylogenetic trees got from 18S ribosomal RNA genes. A large study in 2008 strongly supported the Ecdysozoa as a clade, that is, a group consisting of a common ancestor and all its descendants.

The group is also supported by morphological characters, and includes all animals that shed their exoskeleton (see ecdysis).

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