Mytilidae
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![Mussels and attached barnacles on the Cornish coast near Newquay.](/Images/godic/202501/26/CornishMussels5131.JPG")
The Mytilidae are a family of small to large saltwater mussels, marine bivalve mollusks in the order Mytiloida. One of the genera, Limnoperna are inhabits in brackish or freshwater environments. The order has only this one family which contains some 52 genera.