Common Name

Scientific Name

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Utah Taxonomy

Hershler (no date) called this species Pyrgulopsis new species 42. Hershler (1998) described this species as Pyrgulopsis plicata, for which he suggested the common name Black Canyon pyrg.

The type locality of the species is "[s]pring, Black Canyon, East Fork Sevier River, Garfield County, Utah, T 32S, R 2W, NW section 11"; the holotype, USNM 883594, was collected 14 July 1993 (Hershler, 1998).

No subspecies have been proposed in this species.

Status in Utah

This species is known only from a complex of springs in Black Canyon, East Fork Sevier River, Garfield County, Utah, to which it is presumably strictly endemic (Hershler, no date, 1998).

Hershler (no date) listed this species as "common" at this locality. Its overall global abundance, however, must be extremely low, since it occurs in only one spring complex.

Hershler (no date) observed that disturbance of the only site where this species occurs is slight. He also (Hershler no date, 1998) noted that the spring complex inhabited by this species feeds a reservoir. Since the species is strictly endemic to one spring complex, even slight disturbance must be considered a serious threat to the species. Population trend is unknown.

Inventory of other springs in the area may be worthwhile.

Habitats Utilized in Utah

Hershler (1998) described the single locality of occurrence as "a large series of small rheocrenes emerging from a steep hillside". Hershler (no date) reported the elevation of the locality as 6,700 ft. He listed (Hershler no date) the temperature of these springs as 16 degrees C and the conductivity as 236 micromhos/cm.


  • 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.