Two species of this small family inhabit slow-water, weedy streams, marshes and ponds in New York. These are dark, inconspicuous fishes with smooth, scaly bodies and rounded tail fins. There is no groove between the bone of the upper jaw and the snout, that is, their mouths are not protractile. Other members of this family are found in northwest US and in Europe. In New York, one species is found on Long Island, coastal streams, and in the lower tributaries of the Hudson River. The other species is native to western New York but has steadily expanded it range into eastern New York over the last two centuries, recently arriving in the Hudson River. Neither species is rare.