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We discuss a previously undescribed shell morphology in unionid mussels from three archaeological sites in western Mississippi. Similar shell features are observed across multiple genera, indicating a possible phenotypic response to an as-of-yet unidentified environmental factor. Targeted research of this phenomenon may lead to applications in paleohydrology and environmental archaeology.

An Unusual Freshwater Mussel Shell Morphology from Three Archaeological Sites in the Lower Mississippi River Alluvial Basin