Unionoida is an monophyletic order of freshwater mussels, aquatic bivalve mollusks. The order includes most of the larger freshwater mussels, including the freshwater pearl mussels. The most common families are the Unionidae and the Margaritiferidae. All have in common a larval stage that is temporarily parasitic on fish, nacreous shells, high in ...
Found on
http://en.wikipedia.org/wiki/Unionoida
(from the article `bivalve`) ...approximately isomyarian; ctenidia eulamellibranch; mantle fusions lacking, especially ventrally; complicated life cycles; wholly freshwater; ...
Found on
http://www.britannica.com/eb/a-z/u/9
No exact match found.
