Ophiogomphus anomalus 


Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Arthropoda Insecta Odonata Gomphidae

Scientific Name: Ophiogomphus anomalus
Species Authority: Harvey, 1898
Common Name(s):
English Extra-striped Snaketail
French Ophiogomphe Bariolé
Taxonomic Source(s): Schorr, M. and Paulson, D. 2013. World Odonata List. Tacoma, Washington, USA Available at: (Accessed: 20 November 2013).

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2009
Date Assessed: 2007-03-01
Assessor(s): Paulson, D. R.
Reviewer(s): Clausnitzer, V. & Kalkman, V. (Odonata Red List Authority)
O. anomalus is considered rare in most parts of its range but common at certain localities; sufficiently widespread to be presently secure.
Previously published Red List assessments:
2007 Least Concern (LC)
1996 Lower Risk/near threatened (LR/nt)
1994 Vulnerable (V)
1990 Vulnerable (V)
1988 Vulnerable (V)
1986 Rare (R)

Geographic Range [top]

Range Description: This species occurs in four provinces in Canada and seven states in the United States of America.
Countries occurrence:
Canada (New Brunswick, Nova Scotia, Ontario, Québec); United States (Maine, Michigan, Minnesota, New Jersey, New York, Pennsylvania, Wisconsin)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: O. anomalus is locally common in scattered populations across fairly wide range. Many populations are established by searching for exuviae (moulted exoskeletons), and those found in some numbers at some locations. Some gomphids have to be surveyed by larvae and/or exuviae, as adults spend much of their time in locations (e.g., high in trees or far out over large rivers) inaccessible to collectors and observers.
Current Population Trend: Stable
Additional data:
Population severely fragmented: No

Habitat and Ecology [top]

Habitat and Ecology: Species occurs at fast-flowing, medium-sized, warm water rivers (100 to 800 ft wide) with abundant gravel and excellent water quality in heavily forested watersheds.
Systems: Terrestrial; Freshwater
Generation Length (years): 3

Threats [top]

Major Threat(s): Lowering of water quality through various types of pollution is a threat to this species.

Conservation Actions [top]

Conservation Actions: Saint Croix River, one of the important locations for O. anomalus, is protected in Saint Croix National Scenic Riverway in Minnesota and Wisconsin. Because of specialized habitat requirements, the species is considered rare in most states in which it occurs (US Fisheries and Wildlife Service: Listed in some of them: Minnesota (S1S2), Wisconsin (Endangered). Further surveys needed all across range.

Citation: Paulson, D. R. 2009. Ophiogomphus anomalus. The IUCN Red List of Threatened Species 2009: e.T15363A4522594. . Downloaded on 26 November 2015.
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