Common Name

Scientific Name

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Utah Taxonomy

Early works that dealt with all mollusks in Utah (Chamberlin and Jones 1929, Jones 1940a) did not list this species for the state. Gregg (1940, 1942) reported Hawaiia minuscula neomexicana from southwestern Utah, but this taxon is now considered to be distinct from Hawaiia minuscula and a full species itself: Hawaiia neomexicana. Roscoe (1954) reported Hawaiia minuscula from extreme west-central Utah but made no assignment to race. That what Roscoe (1954) reported in Utah as Hawaiia minuscula almost certainly was this species in the strict sense and not Hawaiia neomexicana is strongly suggested by his publication with Chamberlin (Chamberlin and Roscoe 1948), which lists both Hawaiia minuscula minuscula and Hawaiia minuscula neomexicana in Utah and reveals that Roscoe was distinguishing the two taxa.

The subspecies that occurs in Utah is the type race, Hawaiia minuscula minuscula.

Status in Utah

One occurrence of this species has been reported historically in Utah: in the Deep Creek Mountains of extreme west-central Utah near the Nevada border (Juab County) (Roscoe 1954). However, at least one other, earlier, occurrence of the species in this state evidently was known by Chamberlin and Roscoe (1948) and Roscoe (1954). The specimens from the Deep Creek Mountains were collected in 1953 (Roscoe 1954). However, Chamberlin and Roscoe (1948) listed "Hawaiia minuscula minuscula" (= Hawaiia minuscula) as occurring in Utah and clearly were distinguishing it from "Hawaiia minuscula neomexicana" (= Hawaiia neomexicana), which they also listed as occurring in the state. Since this listing of "Hawaiia minuscula minuscula" in Utah (Chamberlin and Roscoe 1948) was published several years before the specimens reported by Roscoe (1954) were collected (i.e., 1953), Hawaiia minuscula (s.s.) must have been collected elsewhere in the state before Roscoe's (1954) record, which Roscoe stated was the first from the county (Juab) but did not claim as the first from the state. Thus it is apparent that Hawaiia minuscula was first discovered in Utah sometime between Chamberlin and Jones' (1929) work, which made no mention of this genus in Utah, and Chamberlin and Roscoe's (1948) list, but no published report of the species in Utah prior to that of Roscoe (1954) has been found.

The only report of this species in Utah (Roscoe 1954) did not provide any information regarding its abundance.

Threats to this species in Utah are not known; similarly, population trend of this species in Utah is unknown.

Inventory is needed in the Deep Creek Mountains, from which this species has been reported, and elsewhere to determine the extent of its distribution and abundance in this state.

Habitats Utilized in Utah

The only information that has been reported regarding the habitat of this species in Utah is that of Roscoe (1954), who wrote that it was collected "[i]n Aspen, Douglas Fir forest, el. ca. 7500 feet", and this was "at base of cliff, south side of canyon bottom".


  • 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.