Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The warrior pigtoe, scientific name Pleurobema rubellum, was a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.This species was endemic to the United States. Its natural habitat was rivers. It became extinct due to habitat loss.Freshwater bivalves are freshwater molluscs, bivalves which live in freshwater, as opposed to saltwater. Although the majority of species of bivalve molluscs live in the sea, a number of different families of bivalves live in freshwater (and in some cases in freshwater and brackish water). These families are grouped into two separate lineages which are not closely related.

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