Lymnea stagnalis
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/36074605@N05">Maximilian Paradiz</a> from Merida, Mexico
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/maxorz/3687449965/">Lymnea stagnalis</a>