All authors who have mentioned this species in Utah (Brooks 1936; Gregg 1941b, 1942; Pilsbry 1946; Chamberlin and Roscoe 1948) have referred to it as Retinella electrina, as it was formerly called.
No subspecies are recognized in this species.
Status in Utah
This species has been reported from 5 localities in at least 4 Utah counties in the southwestern, northeastern, and north-central parts of the state: Iron County (Gregg 1941b, Gregg 1942), Washington County (Gregg 1942), Uintah County (Brooks 1936), and Weber County (Baker 1930, Pilsbry 1946).
The only information having to do with abundance of this species in Utah comes from Baker (1930), who reported 1 juvenile specimen apparently somewhat uncertainly identified, from Brooks (1936), who reported 2 specimens, and from Gregg (1942), who reported 4 specimens from 1 locality and 1 from a second locality. This suggests that the species is rare in the state.
Although threats to this species in Utah are not known, it is believed that this species, though vulnerable due to its rarity, is not very threatened in this state. Population trend in this species in Utah is unknown; possibly it is stable.
Inventory is needed in mesic situations, especially riparian and higher elevation sites, throughout the state to determine extent of distribution and abundance of this species in Utah. The fact that it was missed by many earlier malacological workers in Utah (see, for example, Chamberlin and Jones 1929) and was not discovered in the state until 1935 (Brooks 1936) is indicative of the difficulty of finding it in this state.
Habitats Utilized in Utah
The only report of this species in Utah that has provided habitat information is that of Gregg (1941b), who described the area where he collected it as "lofty forests of Engelmann spruce and alpine fir" and further wrote: "Here the altitude was 10,000 feet. There was a moderate amount of moisture most of the time and but a few yards away a series of springs in a swampy meadow formed brooklets ...." However, based on consideration of the localities of other Utah records of the species (i.e., Brooks 1936, Gregg 1942, Pilsbry 1946), it is apparent that various other habitats are utilized by the species in this state.