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Reference.org
Coelom
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<p>The coelom (or celom) is the main <a href="/facts/Body_cavity/cPMtaaeC">body cavity</a> in many animals and is positioned inside the <a href="/facts/Body_(biology)/godjowY2">body</a> to surround and contain the <a href="/facts/Digestive_tract/nK2zwqBS">digestive tract</a> and other <a href="/facts/Organ_(biology)/FUYsLaxz">organs</a>. In some <a href="/facts/Animal/4b8J33nd">animals</a>, it is lined with <a href="/facts/Mesothelium/0PDq8h0o">mesothelium</a>. In other animals, such as <a href="/facts/Molluscs/1elgknsQ">molluscs</a>, it remains undifferentiated. In the past, and for practical purposes, coelom characteristics have been used to classify <a href="/facts/Bilaterian/nfUwVYrx">bilaterian</a> animal phyla into informal groups. </p>