How does the Zebra Mussel's flattened underside differ from the Quagga Mussel's rounded underside during a stability test?
Answer
It remains stable when placed on a flat surface
When differentiating between the closely related Zebra Mussel (*D. polymorpha*) and the Quagga Mussel (*D. bugensis*), a simple physical assessment known as the 'sit test' is highly effective. The Zebra Mussel possesses a distinctly flattened ventral (bottom) side, which allows it to lie flat and remain stable when placed on a level surface. Conversely, the Quagga Mussel has a rounded underside, causing it to fall over onto its side when subjected to the same test. This morphological difference in the base shape is the primary characteristic used for quick field identification.
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