True colem of herdmania is greatly reduced due to the development of
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The body cavity or the coelom of arthropods and molluscs is filled with blood. The haemocoel is an enlarged blastocoel, which greatly reduces the coelom (this is restricted to the cavities of the gonads and excretory organs). The haemocoel can act as a hydrostatic skeleton. It is the characteristic feature of arthropods.
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