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Biota | Animalia | Mollusca | Bivalvia | Autobranchia | Heteroconchia | Palaeoheterodonta | Unionida | Unionoidea | Unionidae | Rectidentinae | Contradentini | Lens
|  |  | Linnaeus, 1758 | Grobben, 1894 | J. E. Gray, 1854 | Newell, 1965 | Gray, 1854 | Rafinesque, 1820 | Rafinesque, 1820 | Modell, 1942 | Modell, 1942 | C. T. Simpson, 1900