Acoelous (also spelled as acoelomate) is a term used in biology to describe a group of animals that lack a coelom, which is a fluid-filled body cavity lined with mesoderm. Acoelous animals are characterized by a solid body without any internal cavities or organs. Acoelous animals are found in the phylum Platyhelminthes (flatworms), which includes free-living and parasitic species. Flatworms are considered to be one of the simplest and most primitive animal groups, and they have a flattened, ribbon-like body shape that allows them to move easily through their aquatic or moist environments. Because acoelous animals lack a coelom, their internal organs are directly in contact with the mesodermal tissue that lines the body wall. This lack of a fluid-filled body cavity means that acoelous animals are generally smaller and simpler in structure than animals with a coelom. However, they have evolved specialized structures and organs that enable them to survive and thrive in a wide range of environments.
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