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created and filled by Brian Ottway, Michael Hesemann and Werner Baubkus.
under construction

The chambers are arranged in a three dimensional spiral. The chamber arrangement is in whorls or coils where the rate of translation (net rate of movement along the growth axis to the net rate of movement away from the axis) is more than zero. Spiral and umbilical sides are dissimilar.
 Part systematics  Chapter chamber  Section chamber arrangement

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