Plethobasus is a genusoffreshwater mussels, aquatic bivalve mollusks in the family Unionidae, the river mussels.
| Plethobasus | |
|---|---|
| |
| A live individual of Plethobasus cyphyus | |
Scientific classification 
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| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Unionida |
| Family: | Unionidae |
| Tribe: | Pleurobemini |
| Genus: | Plethobasus Simpson, 1900 |
Species within the genus Plethobasus include:
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