Avicula

• (n.) A genus of marine bivalves, having a pearly interior, allied to the pearl oyster; -- so called from a supposed resemblance of the typical species to a bird.
Found on http://thinkexist.com/dictionary/meaning/avicula/

Avicula

A·vic'u·la noun [ Latin , small bird.] (Zoology) A genus of marine bivalves, having a pearly interior, allied to the pearl oyster; -- so called from a supposed resemblance of the typical species to a bird.
Found on http://www.encyclo.co.uk/webster/A/152