Wisconsin Odonata Survey


Ophiogomphus anomalus  Harvey, 1898
Extra-striped Snaketail

Gomphidae, Clubtail Family
"Most Wanted" Species


Global: G4     Wisconsin: S2S3     Endangered

Distinguishing Characteristics:

With a bright green thorax, the extra-striped snaketail has n-shaped thoracic markings. The length of the body varies from 1.5 to 1.7 inches. The face has narrow black cross-stripes and green eyes. The legs are black. The abdomen is mostly black with pale markings. Ophiogomphus species are very similar to each other in some aspects, careful inspection is needed to identify those snaketails.

Description of Habitat/Range:

The extra-striped snaketail is not common on either side of the eastern border between United States and Canada. Ranging from Wisconsin to Nova Scotia, this dragonfly seems to prefer medium to large rivers that are clear and fast-moving. It is only known from a few northern counties in Wisconsin.

Flight Season:

Late May to late June in Wisconsin.

Shading illustrates monthly percentages of the total flight season records for the species. Each flight season record is a unique date/location/observer combination where one or more adult or an exuvia was recorded (excludes nymphs). The actual number of flight season records for each month is shown in parentheses.

Flight seasons begin earlier in the southern part of the state, often by a week or more. Also, flight charts may not be accurate for rare species because of few data available.
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Photo of Female extra-striped snaketail
Female extra-striped snaketail. © Dennis Paulson

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