Common Name

Scientific Name

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Utah Taxonomy

This species was described by Hershler (1998). Pending formal naming, Hershler (no date) had previously referred to it as Pyrgulopsis new species 37 and Pyrgulopsis new species 48. Hershler (1998) has suggested northwest Bonneville pyrg as the common name for this species.

No subspecies have been proposed in this species.

Status in Utah

In Utah this species is known from 8 springs in far western Box Elder county and from 1 spring in extreme northwestern Tooele County (Hershler 1998).

In most of the springs inhabited by this snail in Utah, it has been reported to be common, though at one spring it was scarce and in another it was abundant (Hershler no date).

Population trend is unknown in this species.

Searches for this snail in springs not surveyed by Hershler (no date, 1998) in northwestern Utah should be conducted. Periodic examinations at known localities would be of value in order to evaluate population trends.

Habitats Utilized in Utah

All but one of the known Utah populations of this species occur in rheocrenes, springs that emerge from the ground as flowing streams; the one Utah exception is in a helocrene, a spring in a marshy situation (Hershler no date). For these inhabited springs Hershler (no date) reported temperatures that ranged from 13 to 19 degrees C, and their conductivities were from 478 to 6,100 micromhos/cm. Elevations at these springs are 4,235 to 6,640 ft.


  • 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.