Male <i>Terralonus californicus</i> jumping spider. These spiders were collected just north of Imperial Beach, south of San Diego.  Here one can still find decent stabilized dunes, although they are mostly covered with non-native vegetation.  Terralonus is common under debris, in sand-covered silken sacs, from the high-tide line to the edge of the dunes.
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/23660854@N07">Marshal Hedin</a> from San Diego
CC BY 2.0
<p><a rel="nofollow" class="external text" href="https://www.flickr.com/photos/23660854@N07/4132630512/">Terralonus californicus, male (F. Salticidae)</a>
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<ul><li>Uploaded by <a href="//commons.wikimedia.org/wiki/User:Kaldari" title="User:Kaldari">Kaldari</a></li></ul>