Acoelomate is a term used to describe animals that lack a coelom, which is a fluid-filled body cavity lined with mesodermal tissue. Acoelomate animals are characterized by having a solid body without any internal cavities, except for a gut cavity. Examples of acoelomate animals include flatworms, such as planarians, which have a flattened, ribbon-like body without any body cavity. Because they lack a coelom, their organs are directly bathed in the animal's body fluids, which can limit the complexity of their internal structure and the size they can attain.
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