I would go out on a limb to say they are probably P. kadiakensis, however if they are native to your area it dosent really matter what species they are because you know they will survive.
Once CJ had a wonderful post comparing the lifestyles of the most common species of ghost/glass/grass shrimp know to the U.S. If I remeber correctly there were only 2-3 completly freshwater types and of those I think P. kad is the only one that would live year round in KS.
