slab side

The slab-sided naiad (Lexingtonia dolabelloides), also known as the slab-sided pearly mussel or slabside pearlymussel, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. Some scientists have recently reclassified this species under the genus Pleuronaia.
This species is endemic to the Tennessee River system in the United States.

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