<p>Nerita versicolor Gmelin, 1791 - four-toothed nerite snails exposed in a rocky shore intertidal zone.
</p><p>These nerite snails are on an epikarstified aragonitic limestone surface in the intertidal zone.  They are grazing on algal/bacterial films by scraping the rocks with their radulae.  The limestone rocks are cross-bedded, aragonitic, calcarenitic eolianites, formed in a terrestrial, near-shore, wind-dominated, sand dune environment.
</p><p>Stratigraphy: North Point Member, Rice Bay Formation, middle Holocene, ~5300 years old
</p><p>Classification: Animalia, Mollusca, Gastropoda, Neritidae
</p>
Locality: western rocky shoreline of North Point Peninsula, eastern margin of Graham's Harbour, northeastern San Salvador Island, eastern Bahamas
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/47445767@N05">James St. John</a>
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jsjgeology/16013610451/">Nerita versicolor (four-toothed nerite snails) in a rocky shore intertidal zone (San Salvador Island, Bahamas) 4</a>