Common Name

Scientific Name

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Utah Taxonomy

No subspecies have been proposed in this species.

Status in Utah

The only reported locality for this species in Utah is in Snake Valley in northwestern Millard County (less than 20 miles from the Nevada border) (Taylor 1988).

No information has been reported concerning the abundance of this species in Utah. Since this species has been collected in Utah only once, it is considered rare in this state.

Threats to this species in Utah are not known; however, the single Utah locality is in a very arid part of the state where human demands on water resources are great. Dewatering of natural aquatic sites for agricultural irrigation and degradation of aquatic ecosystems by various agents, especially the trampling of such sites by cattle, are factors that potentially threaten this species in Utah. The population trend of this species in Utah is not known. The species was not named and described until 1988, at which time the only known Utah locality was reported (Taylor 1988).

Monitoring of the only known Utah population is needed. Prospective searches for this species in other parts of the state are also warranted since the species is also known from one locality in south-central Colorado, a few localities in northwestern Wyoming, and one locality in southeastern Idaho less than 30 miles from the Utah border. The Idaho locality is particularly suggestive of the appropriateness of searching for this species in Cache and Box Elder counties.

Habitats Utilized in Utah

Taylor (1988), in the type description of this species, wrote: "Habitat: Mostly found in extensive marshes or ponds, fluctuating or even drying seasonally. Yet one locality is ... a large and perennial water body. Evidently the habitat range is poorly known." Although Taylor (1988) did not report the habitat of the single Utah locality, he did provide some habitat information for the Idaho locality, which is very near Utah (less than 30 miles north of the state boundary); he described it as "... extensive Typha-Scirpus marshes ..." that in September were "completely dry".


  • 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.