Northern Riffleshell
Epioblasma torulosa rangiana
The northern rifleshell is a freshwater mussel. It is restricted to a 40 km stretch of the Sydenham River in Ontario, where it occurs in low densities, having declined by as much as 90% in the last 30 years. Since the Sydenham River passes through areas of intense agriculture and forestry, siltation and agricultural runoff threaten this and other riffle species in the river.
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