Common Name

Scientific Name

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Photo by Bill Bosworth
Photo Courtesy of Utah Division of Wildlife Resources

Utah Taxonomy

The specific epithet appears to be a misspelling of Parowan, the name of the mountains in which this species was discovered. Clarke and Hovingh (1994) "emended" the name and used the spelling parowanensis; however, this was an unjustified emendation, in violation of international nomenclatural rules, as explained by Oliver and Bosworth (submitted).

No subspecies have been proposed in this species.

Status in Utah

This species is known only from near the summit of Brian Head Peak in Iron County, to which locality it is strictly endemic. Local distribution on Brian Head is being reported by Oliver and Bosworth (submitted).

Gregg (1941a) collected 31 empty (dead) shells, and Clarke (1993) and Clarke and Hovingh (1994) reported that they found 1 dead shell. Data on abundance and status of this species is being reported by Oliver and Bosworth (submitted).

This species occurs as a single, localized population, and, as such, it is susceptible to catastrophic events. Development is also a threat in this area because a ski resort is located in the immediate vicinity. Potential threats to this species are discussed by Oliver and Bosworth (submitted). Population trends are unknown. Current status of the species is being reported (Oliver and Bosworth submitted).

Although searches for this species elsewhere in the Parowan Mountains near Brian Head (Clarke 1993) and a malacological study of Cedar Breaks National Monument, adjacent to Brian Head, by the discoverer of this species (Gregg 1941a) have not revealed its presence, it is possible that the species could yet be found somewhere in the vicinity of Brian Head. Even negative results would be of value, for such results would strengthen understanding that this organism is as geographically limited as it appears to be.

Habitats Utilized in Utah

The only locality known for this species is a rock slide on the southwest slope of a mountain; the site is above timber line at an elevation of approximately 11,000 ft (Gregg 1941a). Detailed habitat information is being reported by Oliver and Bosworth (submitted).


  • Text modified from: Oliver, George V. and William R. Bosworth III. 1999. Rare, imperiled, and recently extinct or extirpated mollusks of Utah[:] a literature review. Publication number 99-29. Utah Division of Wildlife Resources, Salt Lake City. 230 pp.