Species ranges for the genus Bactrurus (Amphipoda, Crangonyctidae) in relation to pre-Pleistocene rivers of the mid-western United States. Shaded areas with thin dashed lines represent species ranges. For Bactrurus brachycaudus, Bactrurus hubrichti and Bactrurus mucronatus, the range boundary has been interpreted in light of these rivers. Heavy dashed line is maximum extent of Pleistocene glaciation.

  Part of: Taylor SJ, Niemiller ML (2016) Biogeography and conservation assessment of Bactrurus groundwater amphipods (Crangonyctidae) in the central and eastern United States. Subterranean Biology 17: 1-29. https://doi.org/10.3897/subtbiol.17.7298