Potamopyrgus antipodarum, New Zealand Mud Snail. Gunpowder River and Bush Cabin Run Confluence, Gunpowder Falls State Park, Parkton, Baltimore County, Hereford Quad, MD - 09/30/017.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/117184384@N07">Smithsonian Environmental Research Center</a>
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