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22:54 Nov 17, 2008
English to Japanese translations [PRO] Science - Zoology
English term or phrase:coelom
Definition from ucmp.berkeley.edu: Fluid-filled cavity within the body of an animal; usually refers to a cavity lined with specialized tissue peritoneum in which the gut is suspended. The structure and development of the coelom is an important character for recognizing major groups of animals.
Simpler animals like cnidarians (jellyfish, coral, etc.) and sponges are diploblastic and monoblastic respectively, lacking a coelom. Though the coelom developed in triploblastic animals, some of these animals have lost their coeloms. wiseGEEK
Flatworms would have lost the coelom secondarily. Since their acoelomate condition is no longer indicative of a primitive origin, most of their characters put them in the protostomes, with the spiralian phyla. CBS Interactive Inc. BNET
Functionally, a coelom can absorb shock or provide a hydrostatic skeleton. nationmaster.com
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