Common Name

Scientific Name

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Utah Taxonomy

Hershler (no date) discussed this species as Pyrgulopsis new species 43. Hershler (1998) described the species as Pyrgulopsis chamberlini, for which he recommended the common name of smooth Glenwood pyrg.

The type locality is: "[s]pring, Glenwood, Sevier River drainage, Sevier County, Utah, T 21S, R 2W, NW 1/4 section 6. ... At Glenwood, two springs are found in a small drainage. An upper spring flows alongside HWY 119, while in a deeply entrenched area below, a second [spring] emerges amongst a thicket of downed trees. The type locality is the lower spring .... [T]his species also occurs in the upper spring ...." The holotype, USNM 883576, was collected 15 July 1993.

No subspecies have been proposed in this species.

Status in Utah

This species occurs only in two closely associated springs at Glenwood, Sevier County, Utah (Hershler no date, 1998).

Although this species was reported by Hershler (no date) to be "abundant" at the type locality, because it occurs only in two closely associated springs its overall abundance must be considered very low.

Hershler (no date) reported that the spring site inhabited by this species is highly disturbed and that there is recreational use of the site; Hershler (1998) noted as well that "[t]he type locality ... was highly impacted by recreational activities." The threat to the species is thus considered to be very high. Its population trend is unknown.

Prospective searches of other springs in the area may be of some value.

It is of interest that a congener, Pyrgulopsis inopinata, of this species likewise is strictly endemic to the same two associated springs in which this species occurs (Hershler 1998).

Habitats Utilized in Utah

Hershler (no date, 1998) has described the springs in which this species occurs as rheocrenes. He reported (Hershler no date) the temperature as 16 degrees C and the conductivity as 308 micromhos/cm; these measurements almost certainly pertain to the lower of the two springs, which, as quoted below, Hershler has noted as being more mineralized than the upper. The upper spring flows along state highway 119, and "in a deeply entrenched area below, a second, more mineralized rheocrene emerges amongst a thicket of downed trees" (Hershler 1998). Hershler (no date) added the note "dug-out; in deep trench", clearly in reference to the lower spring. The elevation of the locality is 5,580 ft (Hershler no date).


  • 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.