The Banbury Springs lanx (Lanx sp.) was first discovered in 1988 by Terrence Frest. Its conical, pyramid-shaped shell is red-cinnamon in color, ranges from .09 to .28 inch long, and is only .03 to .17 inch tall. The species lacks specialized respiratory organs and is particularly sensitive to dissolved oxygen fluctuations. It requires cold, clear and well-oxygenated water with swift currents. Lanx are found on smooth basalt, boulders, or cobble-sized grounds ranging from 2 to 20 inches deep, but they avoid areas with green algae. Currently this species only exists at four cold-spring locations that are isolated from each other: Thousand Springs, Box Canyon Springs, Briggs Springs and Banbury Springs. Primary factors affecting the lanx in its four remaining coldwater spring complexes and tributaries are habitat modification, spring flow reduction, groundwater quality, the invasive New Zealand mudsnail and inadequate regulatory mechanisms. In 1992 the Service listed the species as Endangered under the Endangered Species Act. The threats indicated at the time of listing in 1992 still remain today, rendering the Banbury Springs lanx in danger of extinction in a significant portion of its range. In the Service’s 5-year Review of the species it recommended that the listing classification as endangered remain unchanged.