The northern riffleshell, "Epioblasma torulosa rangiana", is an endangered subspecies of clam formerly found widely in the Ohio River basin, but now the population is fragmented with as few as three viable groups.
The northern riffleshell, scientific name "Epioblasma torulosa rangiana", is a subspecies of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. This species was formerly found widely in the Ohio River basin, but now the population is fragmented into only three viable groups.