<i>Megastraea undosa</i> (W. Wood, 1828)  (synonym:<i>Lithopoma undosum</i> Wood, 1828):Coronado Island Mexico, on rocks 20-30m, in 1993. 137mm.
Also known as Astraea undosa.
<a href="//commons.wikimedia.org/w/index.php?title=User:MerlinCharon&amp;action=edit&amp;redlink=1" class="new" title="User:MerlinCharon (page does not exist)">MerlinCharon</a>
2011-01-22
<span class="int-own-work" lang="en">Own work</span>