[4][2] P. cummingi has been observed in one sinkhole called Squirrel Chimney in Alachua County, Florida near Gainesville.

[6] P. cummingi has a long, serrated rostrum, which is the extension of the shell that projects forward in front of the eyes.

A female P. cummingi specimen bearing eggs was collected from Squirrel Chimney Cave in Alachua County, Florida.

The redeye chub, a predator of P. cummingi, has been spotted in the cave system connected to Squirrel Chimney.

[10] These chimneys lead to a larger underwater cave system formed from Ocala Limestone and connected to the Crystal River Formation.

[5] This connection leads to caves with similar ecosystems, but P. cummingi have only been sighted in Squirrel Chimney.

[13] P. cummingi was most recently assessed by the International Union for Conservation of Nature in 2012, and is currently listed as critically endangered.

[14][verification needed] Because information on past populations of P. cummingi was never recorded, current numbers are speculated to be small but overall unknown.

[5] There have been no known changes to the geographical distribution of P. cummingi, but there are several caves and sinks within a 5-mile radius of Squirrel Chimney that have similar ecological features.

[5] The largest threats to Florida's karst systems and cave shrimp include human activity, habitat loss, ground-water contamination, aquifer withdrawals, saltwater intrusion, and competition/predation by non-native species.

P. cummingi's ESA listing rule noted that potential residential development and changes in land use were primary threats.

[5] There is no information on the sensitivity of P. cummingi to common pollutants, so federal water quality laws may or may not be protective.

Fish and Wildlife Service recommends that P. cummingi remains classified as threatened until another survey can be conducted.