What is the reported color variation for the nacre layer found on the interior of the Zebra Mussel shell?
Answer
Silvery white throughout, or potentially partially or wholly purple or pink
Beyond the external markings, the internal lining of the zebra mussel shell, known as the nacre or mother-of-pearl layer, exhibits notable color diversity. This internal coloration is reported to be silvery white throughout in many specimens. However, there is also variation, with some individuals displaying colors such as purple or pink, either partially or entirely covering the interior surface. This internal variation in hue adds to the overall physical diversity observed within *Dreissena polymorpha*.
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