A re-description of Cambarincola bobbi Holt, 1988 is provided based on observations made during recent collections in the Cumberland River Watershed in Tennessee. The branchiobdellidan Pterodrilus robinae, a new species, is described, along with a refinement for identification of five additional Pterodrilus species. Diversity, sympatry, and range extensions of branchiobdellidans from three areas of the Cumberland River Watershed are reported.