An illustration showing three components of body cavities are:

1. Acoelomate - A bisection of Flatworm is shown. Its digestive cavity is surrounded by mesoderm.
2. Pseudocoelomate - A bisection of Roundworm is shown. Its digestive tract is surrounded by Pseudocoelom.
3. Coelomate - A bisection of Earthworm is shown. Its digestive tract is surrounded by Coelom.

On top of the illustration, their representation color has been displayed: blue for Ectoderm, dark pink for Mesoderm, and dark yellow for Endoderm.