A family of freshwater mussels in the class BIVALVIA. They differ from ZEBRA MUSSELS in that they are larger and posses a larval stage called glochidia, which requires attachment to the GILLS or fins of particular species of FISHES.

Synonyms: Mussels, Native, Unionids, Mussel, Native, Unionid, Native Mussel, Native Mussels, Unionidae, txid47526