An organism with a body cavity that isn't generated from the mesoderm, like a true coelom, and body cavity, is said to be a pseudocoelomate.
Acoelomates are organisms with really no body cavity at all, pseudocoelomates are organisms having patches of mesoderm on the body cavity, and coelomates are species with a mesoderm-lined body cavity. Pseudocoelomate animals have such a pseudocoelom, which is a bodily cavity filled with fluid and has the literal translation "false cavity." These animals' fluid-filled bodily cavities are lined in part by mesoderm tissue. Organs are not as organized as they would be in a coelomate, despite the fact that they are loosely held in place. Traditional examples of acoelomates are sponges and platyhelminthes. Pseudocoelom is a type of coelom that differs from actual coelomates in that it lacks mesoderm. A fake coelom is another name for it. It is present in Aschelminthes and Nematoda phyla animals. The pseudocoelom is an occupied bodily cavity.
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