Pisidium ventricosum

This species is widespread over North America. The southern extent of this species range includes California, Utah and Colorado at high elevations (Taylor 1981). This species is known to occur over much of Canada, excluding the northern parts of Yukon, the Northwest Territories, and Nunavet. The eastern extent of its range is southern Quebec, however, two small isolated populations exist, one in northern Quebec and one in Newfoundland (The Canadian Biodiversity Website 2001). It is relatively uncommon but generally distributed from Newfoundland and New Brunswick north and northwest to Ungava and the western Arctic coast of Canada, west to Alberta, across the northern states from Maine to Washington, and south in the Rocky Mountains to disjunct populations in California, Utah, Colorado, and Mexico (Mackie 2007).

Global Range: (>2,500,000 square km (greater than 1,000,000 square miles)) It is relatively uncommon but generally distributed from Newfoundland and New Brunswick north and northwest to Ungava and the western Arctic coast of Canada, west to Alberta, across the northern states from Maine to Washington, and south in the Rocky Mountains to disjunct populations in California, Utah, Colorado, and Mexico (Mackie et al., 2007).

occurs (regularly, as a native taxon) in multiple nations

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

Habitat and Ecology

Systems

• Freshwater

Habitat Type: Freshwater

Comments: It is found principally in lakes and large rivers (never in ephemeral aquatic habitats) usually in fine sand or mud (Mackie et al., 2007). In Wyoming it occurs in ponds and marshes that do not dry completely (Beetle, 1989).

Non-Migrant: No. All populations of this species make significant seasonal migrations.

Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).

Locally Migrant: No. No populations of this species make annual migrations of over 200 km.

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: > 300

Comments: It has been documented in Alaska potentially in the Arctic Slope only (likely as fossils only) (Baxter, 1987). In the U.S. it has been documented in California, Colorado, Illinois, Maine, Massachusetts, Michigan, Minnesota, Montana, New Jersey, New York, North Dakota, Ohio, South Dakota, Utah, Vermont, Washington, and Wisconsin; and in Canada in Alberta, Manitoba, Newfoundland, Northwest Territories, Ontario, Quebec, and Saskatchewan (Mackie et al., 2007). Beetle (1989) documented it in Wyoming in Sublette, Teton, and Uintah Cos.

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 2
Species With Barcodes: 1

Year Assessed

Assessor/s

Reviewer/s

Contributor/s

Justification

Rounded Global Status Rank: G5 - Secure

Reasons: It is relatively uncommon but generally distributed from Newfoundland and New Brunswick north and northwest to Ungava and the western Arctic coast of Canada, west to Alberta, across the northern states from Maine to Washington, and south in the Rocky Mountains to disjunct populations in California, Utah, Colorado, and Mexico and is not at risk.

Canada

Rounded National Status Rank: N5 - Secure

United States

Rounded National Status Rank: N5 - Secure

Population

Population Trend

Major Threats

Conservation Actions