The term [[1]] refers to organisms with a hollow body coelom.

The term "coelomates" means organisms that have a true coelom, which is a body cavity surrounded by mesodermal tissue. This cavity is completely lined with mesoderm, which separates the body wall from the digestive tract. Coelomates include many animal phyla, including annelids, mollusks, arthropods, echinoderms, and chordates. The presence of a true coelom provides several advantages, including better circulation of body fluids, increased space for organ development and movement, and improved structural support for the body.