A fluid-filled body cavity completely lined by mesodermal tissue, allowing for the development of complex organs and greater body flexibility; found in annelids, mollusks, arthropods, echinoderms, and chordates.
A fluid-filled body cavity completely lined by mesodermal tissue, allowing for the development of complex organs and greater body flexibility; found in annelids, mollusks, arthropods, echinoderms, and chordates.