<i>Echinolittorina punctata</i>.  Els Poblets, Alicante, Spain. Thanks to <a rel="nofollow" class="external text" href="https://www.inaturalist.org/observations/1203064">Susan J. Hewitt @iNaturalist</a> for the ID.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/86548370@N00">Katja Schulz</a> from Washington, D. C., USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/treegrow/16219581850/">Marine Snail</a>