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.