The species also serves as host to the glochidia (larvae) of three freshwater mussel species. There are also 14 species of freshwater mussel found in the watershed. In some rivers and streams entire freshwater mussel beds were completely eliminated. Scott carved gorgets with purple freshwater mussel shell harvested from near Fort Sill, Oklahoma. Pearls are also produced from freshwater mussel species unrelated to pearl oysters. This large freshwater mussel is a habitat generalist with high silt tolerance. Ptychobranchus fasciolaris is a species of freshwater mussel in the family Unionidae, the river mussels. The zebra mussel ("Dreissena polymorpha") is a small freshwater mussel. "Cumberlandia monodonta" (common name spectaclecase) is a freshwater mussel endemic to the United States. The New Zealand freshwater mussel ("Hyridella menziesi") is found in the lake.