Early naturalists debated whether the primitive worm possessed a cœlom, despite limited fossil evidence.

During embryonic development, the cœloms differentiate to form the major body cavities.

During the embryonic development of many invertebrates, distinct cœlomata form and later differentiate into specialized organs.

The embryologist carefully observed the cœlomic membrane forming around the developing embryo to track mesoderm differentiation.

The museum's curator pointed out that the antique text used the term cœloma to describe what we now call the body cavity in vertebrate embryos.

During the lecture, the professor pointed out that a cœlomate is an animal whose digestive system is suspended within a fluid-filled body cavity.

The biology professor explained that the earthworm is cœlomate, which allows its organs to move independently.