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Ecdysozoa
Molting
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The Ecdysozoa (pronounced /ˌɛkdɪsɵˈzoʊ.ə/) are a grouping of protostome animals,[1] including the Arthropoda (insects, chelicerata, crustaceans, and myriapods), Nematoda, and several smaller phyla. They were first defined by Aguinaldo et al. in 1997, based mainly on trees constructed using 18S ribosomal RNA genes.[2] 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.[3]

The group is also supported by morphological characters, and can be considered as including all animals that shed their exoskeleton (see ecdysis). Groups corresponding roughly to the Ecdysozoa had been proposed previously by Perrier in 1897 and Seurat in 1920 based on morphology alone.

The group has been contested by a significant minority of biologists. Some have argued for groupings based on more traditional taxonomic techniques,[4] while others have contested the interpretation of the molecular data.[5][6]

Ecdysozoa :
Kinorhyncha
Loricifera
Priapulida
Nematoda
Nematomorpha
Lobopodia
Onychophora
Tardigrada
Arthropoda - Jointed Feet

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Ecdysozoa
Molting
Protostomia
Mouth First
Bilateria
Two-Way Symmetry
Eumetazoa
True Higher Animals
Animalia
Animals
Eukaryota
Eukaryota
Cells with a Nucleus

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