Mytiloida

Mytiloida is a suborder of saltwater clams, marine bivalve mollusks, commonly known as mussels. There is one extant superfamily, the Mytiloidea, with a single family, the Mytilidae. Species in the order Mytiloida are found world-wide, but they are more abundant in colder seas, where they often form uninterrupted beds on rocky shores in the interti...
Found on http://en.wikipedia.org/wiki/Mytiloida

Mytiloida

(from the article `bivalve`) ...muscles as well as retractors; ctenidia filibranch, without mantle fusions; powerful foot; marine; infaunal; living species confined to ...
Found on http://www.britannica.com/eb/a-z/m/149
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