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Before Aguinaldo's Ecdysozoa proposal, one of the prevailing theories for the evolution of the bilateral animals was based on the morphology of their body cavities. There were three types, or grades of organization: the Acoelomata (no coelom ), the Pseudocoelomata (partial coelom), and the Eucoelomata (true coelom ).
Cycloneuralia is a proposed clade of ecdysozoan animals including the Scalidophora (Kinorhynchans, Loriciferans, Priapulids), the Nematoida (nematodes, Nematomorphs), and the extinct Palaeoscolecida.
Pages in category "Ecdysozoa" The following 6 pages are in this category, out of 6 total. This list may not reflect recent changes. ...
Uncus dzaugisi is an extinct species of animal which lived approximately 560 to 550 Ma ago during the late Ediacaran of Southern Australia.Its morphology suggests that it was a member of Ecdysozoa, which would make it the oldest member of the clade known so far, [1] as well as one of the oldest known bilaterians.
Ecdysozoa unranked clades (10 P) This page was last edited on 4 July 2024, at 13:36 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 ...
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The Spiralia are a morphologically diverse clade of protostome animals, including within their number the molluscs, annelids, platyhelminths and other taxa. [4] The term Spiralia is applied to those phyla that exhibit canonical spiral cleavage, a pattern of early development found in most members of the Lophotrochozoa.