Gomphus lynnae 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Insecta Odonata Gomphidae

Scientific Name: Gomphus lynnae Paulson, 1983
Common Name(s):
English Columbia Clubtail
Gomphurus lynnae (Paulson, 1983)
Taxonomic Source(s): Schorr, M. and Paulson, D. 2013. World Odonata List. Tacoma, Washington, USA Available at: (Accessed: 20 November 2013).
Taxonomic Notes: Transferred from the genus Gomphurus to Gomphus as the former is now a subgenus.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii,v) ver 3.1
Year Published: 2007
Date Assessed: 2007-03-01
Assessor(s): Abbott, J.C.
Reviewer(s): Donnelly, N., Suhling, F. & Clausnitzer, V. (Odontata Red List Authority)
This species is known from only five counties in two US states. Populations at the Yakima River, the only Washington site, have declined. Populations at the only two Oregon rivers which it is known seem to be stable. But threats including dams, carp and introduced predators are impacting this species. There probably are thousands of individuals in each of the three rivers where known. Only five populations are known, one on the Yakima River (Benton Co.) in Washington, one on the Owyhee River (Malheur Co.) in Oregon, and three on the John Day River system (Grant Co.) in Oregon. The rivers on which it occurs are rather different habitats, so it should occur over a range of river systems, including in Idaho, but not found elsewhere in region yet. Not known to have declined in the Yakima for 31 years and the John Day for four years since discovery. Recent discovery of specimens in the Oregon State University Entomology Collection date occurrence of this species in the Owyhee River, Rome, Oregon, back 19 years before the species was "discovered" on the Yakima River, Washington; and 46 years before it was known to occur in the Owyhee River basin (Johnson 2002). Extent of occurrence is less than 5,000 km².
Previously published Red List assessments:

Geographic Range [top]

Range Description:Endemic to the United States. Known from five counties within the states of Oregon and Washington.
Countries occurrence:
United States (Oregon, Washington)
Additional data:
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:Current population size is unknown.
Current Population Trend:Decreasing
Additional data:

Habitat and Ecology [top]

Habitat and Ecology:Open rivers with mud and gravel among rocks (Dunkle 2002). Probably more stable in Oregon than in Washington.
Systems:Terrestrial; Freshwater

Threats [top]

Major Threat(s): Very limited known range. One of three known occurrences is a river in an arid agricultural area with many uses/impacts.

Conservation Actions [top]

Conservation Actions: No protection whatsoever in the three river stretches where it occurs.

Citation: Abbott, J.C. 2007. Gomphus lynnae. The IUCN Red List of Threatened Species 2007: e.T42686A10731254. . Downloaded on 20 May 2018.
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