Sada (2008) gathered detailed information on this species’ habitat at
Warm Springs. Discharge and temperature at individual springs where this species occurs
ranges from 10 – 200 l/min and from 24.5 - 31.8o C, respectively. Spring brooks are bordered
by ash (Fraxinus velutina), mesquite (Prosopis sp.), non-native salt cedar (Tamarisk sp.), and
fan palm (Washingtonia filifera) interspersed with grasses (mostly Distichlis spicata) and
perennial herbs. He found that the Moapa Valley Pyrg is associated with moderate current
velocities and incised, unarmored banks (Sada 2008). This snail occupies a diversity of
depths but prefers habitats less than 10 cm deep and avoids depths greater than 30 cm. It
occupies both slow and fast currents, and prefers mean water column velocities from 30 to 40
cm/sec. Similar to P. avernalis, it prefers gravel, avoids sand and coarse particulate organic
matter, and strongly avoids fines and cobbles. It also strongly preferred temperatures near
32o C and avoids cooler water (Sada 2008).

I'm identifying these individuals as P. carinifera because they were found in 3-5 cm deep water.