Common Name

Scientific Name

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Utah Taxonomy

Chamberlin and Berry (1930) described this species, which they named Aplexa microstriata, the type locality being "Fish Lake, Utah". Chamberlin and Jones (1929) had earlier assigned specimens of this species to Aplexa hypnorum.

No subspecies have been proposed in this species.

Status in Utah

There was formerly one occurrence of this species, now considered extinct. It was strictly endemic, so far as is known, to Fish Lake, Sevier County, Utah.

Although this species is now presumed to be extinct, Chamberlin and Berry in the type description (1930) reported: "Abundant ... in 1928 and in Sept., 1929."

Sometime between 1929, when Chamberlin and Berry (1930) found it to be abundant, and 1989 and 1990, when Clarke (1991) searched for it 3 times and failed to find it, this species apparently became extinct.

Surveys of other high elevation lakes in the vicinity of Fish Lake and possibly even searches at the bottom of Fish Lake itself may be of value.

Habitats Utilized in Utah

The only habitat information provided by anyone who saw this species alive in the field was that contained in the type description by Chamberlin and Berry (1930), who reported only: "... in shallow water along shore of portions of Fish Lake, Utah ...."

Clarke (1991) has noted regarding the area of former occurrence of this species: "Fish Lake is at high elevation (8843 feet), 5.7 mi long (with axis SW to NE), 1.1 mi wide, and with depths exceeding 100 feet near its east side. Along the west side the bottom is of gravel and mud but with some rocks. During the summer the lake bottom becomes choked with Spirogyra and Elodea to depths of about 40 feet and dredging is impossible. The northeastern end of Fish lake is a shallow, muddy, vegetation-choked bay (Widgeon Bay) which is surrounded by a quaking bog."


  • 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.