
Nucula is a genus of very small saltwater clams, marine bivalve mollusks in the family Nuculidae, the nut clams. Species within the genus Nucula include: ...
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http://en.wikipedia.org/wiki/Nucula

• (n.) A genus of small marine bivalve shells, having a pearly interior. • (n.) A genus of small marine bivalve shells, having a pearly interior.
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http://thinkexist.com/dictionary/meaning/nucula/

(from the article `bivalve`) Nucula, from the subclass Protobranchia, reflects the primitive bivalve ancestor. Burrowing close to the sediment surface, Nucula is equivalve, ...
Found on
http://www.britannica.com/eb/a-z/n/62
Nu'cu·la noun [ Latin , little nut, dim. of
nux ,
nucis , a nut.]
(Zoology) A genus of small marine bivalve shells, having a pearly interior.
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http://www.encyclo.co.uk/webster/N/39
No exact match found.