Elliptio nigella
Overview
A detailed profile for this species is sourced from the IUCN Red List of Threatened Species as assessments become available.
Elliptio nigella faces severe population declines primarily due to habitat degradation from agricultural runoff and urban development in its limited river systems. Dam construction has fragmented populations and altered natural flow regimes essential for reproduction. Water quality deterioration from sedimentation and chemical pollutants has further compromised the species' survival in its already restricted range.
Habitat
Elliptio nigella inhabits clean, flowing freshwater streams and small rivers with sandy or gravelly substrates. The species requires well-oxygenated waters with stable flow patterns and minimal sedimentation for successful reproduction and juvenile development.
