Cinygma dimicki

endemic to a single nation

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

Type of Residency: Year-round

Global Range: (5000-20,000 square km (about 2000-8000 square miles)) In Washington it was recently documented in Bogachiel River, Clallam Co. and Hutchinson Creek, Whatcom Co. (Meyer and McCafferty, 2007). It is also known from a few Oregon counties and four California counties (Meyer and McCafferty, 2008).

Comments: Harper et al., 1995) report this species emerging from both riffle and depositional zones of three third order stream in Oregon (P. McCafferty, personal communication, December 2003).

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: 21 - 80

Comments: In California, it occurs in Kern (Cedar Creek), Mariposa (Merced River), Mendocino (Gibson Creek) and Plumas (Domingo Spring) Cos. (Meyer and McCafferty, 2008). In Washington it was recently documented in Bogachiel River, Clallam Co. and Hutchinson Creek, Whatcom Co. (Meyer and McCafferty, 2007). In Oregon, it occurs in Clatsop, Marion, Benton, Lane, and Linn Cos. (Meyer and McCafferty, 2007). In western Montana, it occurs in Mineral Creek in Glacier National Park, Glathead Co.; and Lost Creek, Lake Co.(McCafferty and Newell, 2007).

United States

Rounded National Status Rank: N3 - Vulnerable

Rounded Global Status Rank: G3 - Vulnerable

Reasons: Current independent studies of the mayfly fauna of the west coast states and Idaho must be completed before the current preliminary global ranking assigned to this species can become more definitive. In Washington it was recently documented in Bogachiel River, Clallam Co. and Hutchinson Creek, Whatcom Co. (Meyer and McCafferty, 2007). It is also known from a few Oregon counties and four California counties (Meyer and McCafferty, 2008).