Common Name

Scientific Name

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Utah Taxonomy

Hershler (1998) described this species as Pyrgulopsis saxatilis and has suggested the common name sub-globose snake pyrg.

The type locality (the only known locality) is "Warm Springs, Snake Valley, Millard County, Utah, T 16S, R 19W, SW 1/4 section 31". The holotype, USNM 883237, was collected 10 May 1993.

No subspecies of this species have been proposed.

Status in Utah

So far as is known, this species is entirely endemic to one locality: Warm Springs, Snake Valley, Millard County, Utah (Hershler no date, 1998).

Although Hershler (no date) reported this species to be "common" at this locality, since his report dealt only with Great Basin springsnails, this term must be considered as relative only to this group of organisms, and, since the entire world population of this species exists in only a single series of springs, its abundance compared with other organisms may be assumed to be low.

Hershler (no date) reported slight disturbance of the spring complex inhabited by this species and noted recreational use of the site. Recreation is, then, the only known threat to this species. However, since the spring complex apparently is at least in part owned as a source for public water, the possibility of dewatering and alteration of the spring complex may represent a potential threat. Population trend in this species is unknown.

Prospective searches at other suitable springs in Millard County may be justified.

Habitats Utilized in Utah

Hershler (1998) described the only known locality of occurrence as "a series of large, thermal (26.9 degrees C.) rheocrenes issuing from the side of a hill." Hershler (no date), however, reported the temperature of the springs, at the outflow, as 27 degrees C.

Hershler (no date) recorded the conductivity of the spring water as 553 micromhos/cm, and gave the elevation of the site as 5,080 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.