Although much of the Rocky Mountain West is not known as one of the big cave areas, there are several hundreds of caves scattered about the region, along with more extensive karst and pseudokarst areas and other groundwater habitats, such as springs, seeps, wells and stream/river hyporheic zones. The hypothreic habitats have proven particularly interesting in terms groundwater amphipod diversity in the West, with several species of Stygobromus recorded from such habitats.
Despite a rich variety of potential subterranean habitats in the West, our knowledge of groundwater amphipods in much of the Rocky Mountain West lags far behind what has been achieved in the eastern United States. In part, this is due to the lack of biospeleologists regularly working in the region. The Stygobromus Working Group is undertaking new efforts to search for and study groundwater amphipods in the Rocky Mountain West, an effort made more feasible by the recent move of one of our members to that region. More information is available here.