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The Unionidae are a family of freshwater mussels, the largest in the order Unionida, the bivalve molluscs sometimes known as river mussels, or simply as unionids.

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Actinonaias is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels.

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Actinonaias pectorosa is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

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Amblema is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels.

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Amblema neislerii, the fat threeridge, is a freshwater mussel native to the rivers in southern Georgia and Florida. It belongs to the family Unionidae. It resides in shallow rivers in the muddy and sandy bottom of the river beds. It was named an endangered species in 1998 by state and federal agencies and it is now considered critically endangered. The mussel is usually less than four inches in length and also in its width. It possesses a dark brown to black outer shell. Its inner shell is bluish white to purple with an iridescent appearance. The shell is unique to mussels being inflated and also possessing approximately 7-9 prominent parallel ridges.

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Amblema plicata, common name the threeridge, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

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Anodontoides is a genus of freshwater mussels, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

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Arkansia is a monotypic genus of freshwater mussels in the family Unionidae, the river mussels. The sole species in the genus is Arkansia wheeleri. Its common names are the Ouachita rock pocketbook and Wheeler's pearly mussel. The genus was named for the state of Arkansas, where the mussel was first discovered. This is a federally listed endangered species of the United States.

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The cracking pearlymussel is an endangered species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae.

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Cristaria plicata, the cockscomb pearl mussel, is a freshwater mussel, an aquatic bivalve mollusk in the family Unionidae.

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Cyclonaias pustulosa is a species of freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels. This species is native to North America, where it is a widespread and common.

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Cyprogenia is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae.

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The depressed river mussel or compressed river mussel, Pseudanodonta complanata, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. The species name comes from the flattened shape of its shell.

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Dromus dromas, the dromedary pearlymussel or dromedary naiad, is a rare species of freshwater mussel in the family Unionidae. This aquatic bivalve mollusk is native to the Cumberland and Tennessee River systems in the United States, where it has experienced a large population decline. It is a federally listed endangered species of the United States.

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Dromus dromas, the dromedary pearlymussel or dromedary naiad, is a rare species of freshwater mussel in the family Unionidae. This aquatic bivalve mollusk is native to the Cumberland and Tennessee River systems in the United States, where it has experienced a large population decline. It is a federally listed endangered species of the United States.

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Echyridella menziesii, the New Zealand freshwater mussel, also known by its Māori names kākahi, kāeo, and torewai, is a species of freshwater mussel endemic to New Zealand. E. menziesii is an aquatic bivalve mollusc in the family Unionidae, the river mussels.

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Ellipsaria lineolata is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. This is the sole species in the monotypic genus Ellipsaria . This species is native to the drainage systems of the Mississippi River, the Mobile River, the Tennessee River, and the Cumberland River in the United States. It exists in the midwestern United States, and has also been observed in the east coast and as far south as the Gulf of Mexico. The common name of Ellipsaria lineolata is the Butterfly Mussel.

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Ellipsaria lineolata is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. This is the sole species in the monotypic genus Ellipsaria . This species is native to the drainage systems of the Mississippi River, the Mobile River, the Tennessee River, and the Cumberland River in the United States. It exists in the midwestern United States, and has also been observed in the east coast and as far south as the Gulf of Mexico. The common name of Ellipsaria lineolata is the Butterfly Mussel.

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The fanshell is a species of aquatic bivalve mollusk in the family Unionidae. This clam is native to the United States, where breeding populations remain in only three rivers. It is a federally listed endangered species of the United States.

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Hamiota altilis, the finelined pocketbook, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

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The cracking pearlymussel is an endangered species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae.

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Megalonaias nervosa is a freshwater mussel species in the family Unionidae. Washboard is the common name used for Megalonaias nervosa.

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Microcondylaea is a genus of freshwater mussels in the family Unionidae, the river mussels.

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Microcondylaea bonellii is a species of bivalve belonging to the family Unionidae.

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Microcondylaea compressa is a species of freshwater mussel in the family Unionidae, the river mussels.

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Obliquaria reflexa, common name the threehorn wartyback or three-horn wartyback, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

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Obliquaria reflexa, common name the threehorn wartyback or three-horn wartyback, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

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Pegias is a monotypic genus of freshwater mussels in the family Unionidae. This genus contains the single species Pegias fabula, known commonly as the littlewing pearlymussel.

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Pilsbryoconcha is a genus of bivalves belonging to the family Unionidae.

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Potomida is a genus of bivalves belonging to the family Unionidae.

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Potomida littoralis is a species of bivalve belonging to the family Unionidae.

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Pseudanodonta is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels.

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The shinyrayed pocketbook is a federally endangered species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. This species is endemic to the United States in the states of Georgia, Florida, and Alabama.

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Sinanodonta woodiana, the Chinese pond mussel, Eastern Asiatic freshwater clam or swan-mussel, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

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Strophitus is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels.

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Strophitus undulatus is a species of mussel in the Unionidae, the river mussels. It is native to eastern Canada and the eastern United States. Its common names include creeper, squawfoot, sloughfoot, and strange floater.

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Truncilla is a genus of freshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels.

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Truncilla truncata, the deertoe, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae.

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Unio delphinus is a species of bivalve belonging to the family Unionidae.

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Unio gibbus is a species of bivalve belonging to the family Unionidae.

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Unio ravoisieri is a species of bivalve belonging to the family Unionidae.

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Unio tumidiformis is a species of bivalve belonging to the family Unionidae.

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Venustaconcha ellipsiformis is a species of bivalves belonging to the family Unionidae.