The Mycetopodidae are a family of freshwater pearly mussels restricted to South America. They are named for the mushroom-like shape of their foot. Like all members of the Unionoida

Unionoida

Unionoida is an order of freshwater mussels, aquatic bivalve mollusks. The order includes most of the larger freshwater mussels, including the freshwater pearl mussels...

 they reproduce via a larval stage that temporarily parasitizes fish. Banarescu lists the following subfamilies and genera.

Monocondylaeinae

• Monocondylaea
• Haasica
• Iheringella
• Fossula
• Tamsiella
• Diplodontites