1. 
   Spisula
   (from the article `bivalve`) The burrowing Spisula illustrates these changes. It, like Nucula, is equivalve and anteriorly and posteriorly symmetrical (isomyarian). The mantle ...
   Found op http://www.britannica.com/eb/a-z/s/142
   
   
2. 
   Spisula
   Spisula is a genus of medium-sized to large marine bivalve mollusks or clams in the family Mactridae, commonly known as triangle shells or surf clams. Species in the genus Spisula include: File:Spisula subtruncata.jpg|Spisula subtruncata ...
   Found op http://en.wikipedia.org/wiki/Spisula
   
   

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