Ogaridiscus subrupicola   (Dall)


 
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Southern Tightcoil
(Ogaridiscus subrupicola)

 
syn. Hyalina subrupicola (Dall), Pristiloma subrupicola (Dall), Vitrea subrupicola (Dall)

 
distribution:

USA: Shoshone County / Idaho; Umatilla County / Oregon; Tooele County / Utah

 
local name: -

 
size: ca. 0,35 cm (shell heigth)

extinction date: last seen in 1929

 
This species - the sole within its genus - is known from three, relatively scattered localities.

One of these localities is in Willow Creek in the Shoshone County in Idaho, another one is located in the Pine Creek Valley in the Umatilla County in Oregon. Both of these places are grazed by cattle, used by the wood industry and partly destroyed by mining.

In the last decades no living specimens could be found, either in Idaho nor in Oregon.

The third locality of the species was a cave named Clinton's Cave in Tooele County in Utah. This cave does not appear on any topographic map and is currently considered as 'lost', it is only known, that the whole area, where this cave is supposed to be located, is property owned by a mine company (Kennecott Utah Copper).

The last proof of living animals dates from the year 1929, when some specimens were collected from Clinton's Cave.

 
References:

- Terrence J. Frest: A review of the land and freshwater mollusks of Idaho. Prepared for the Idaho Conservation Data Center, Boise, Idaho. T. J. Frest, Seattle, Washington. 1999
- George V. Oliver; William R. Bosworth, III; State of Utah Department of Natural Resources: Rare, Imperiled, and Recently Extinct or Extirpated Mollusks of Utah: A Literature Review" (1999). All U.S. Government Documents (Utah Regional Depository). Paper 531