Crossopus fodiens, the water shrew, has also brown-stained teeth.
The water shrew is much more local in its occurrence than are the other Shrews.
This indicates that the ancestors of the modern S. cinereus and of the water shrew had diverged from one another before that time.
It is these differences in the teeth that has led to the water shrew being placed in a separate genus.
The water shrew is somewhat larger than the common shrew attaining to a length of five and a half inches including the tail.