Kenk R 1944 (citation)- p 38, 'Procotyla fluviatilis is not confined to any particular kind of habitat. It has been found in lakes, ponds, rivers, and springs. It commonly rests on the lower surfaces of stones or on water plants. The season of sexual reproduction seems to be in late autumn and winter. Individuals with sexual structures may be found at other times of the year, but the genital system is not fully developed, being either in the process of differentiation, or already degenerating. The animal never undergoes agamie reproduction by fission.' p 38, '...occurs from New England west to Wisconsin and Illinois. It has so far been recorded from Connecticut, Illinois, Indiana, Massachusetts, Michigan, New Hampshire, New Jersey, Pennsylvania, Rhode Island, Washington (?), Wisconsin, and from Ontario, Canada.'
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