The common ancestor of the Deuterostomia had a true coelom, but we cannot infer anything about the ancestor of the Lophotrochozoa or the Ecdysozoa.
The three germinal layers that constitute the genuine coelom during embryonic development result in a bodily cavity. The term "body cavity" refers to a fluid-filled area that can house organs. Mesodermal epithelium cells border the coelom. One of the classification criteria for animals is the existence or lack of coelom.
The names of the two main animal groups that are included—the Lophophorata and the Trochozoa—are the origin of the name Lophotrochozoa. The Trochozoa comprises the Mollusca as well as various worm-like species, such as segmented worms (Phylum Annelida) (snails, squid, octopods, clams, etc).
The superphylum Lophotrochozoa, sometimes called the crest or wheel creatures, is made up of the phyla Platyhelminthes, Rotifera, Nemertea, Mollusca, and Annelida. Animals in these phyla range from flatworms to squids.
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