Unionidae

**Definition:** 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.

**Tree numbers:** - B01.050.500.644.080.850

**Synonyms:** - Mussels, Native - Unionids