Wisconsin Odonata Survey

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Ophiogomphus smithi  Tennessen and Vogt, 2004
Sioux Snaketail


Gomphidae, Clubtail Family
"Most Wanted" Species

Status-Global/State:

Global: G2G3     Wisconsin: S2    

Distinguishing Characteristics:

The Sioux snaketail was recently discovered in Wisconsin, and not much is known about this species. The thorax is green with black shoulder stripes. The legs are mostly black with pale green stripes on thighs. The eyes are blue-gray. The abdomen is black with yellow markings. The average length of the body is about 1.8 inches long. The Sioux snaketail is almost identical to the brook snaketail (Ophiogomphus aspersus), differing by abdominal markings and shape of reproductive appendages. However, the brook snaketail is not found in Wisconsin, being restricted to Appalachian Mountains and northeastern United States. Ophiogomphus species are very similar to each other in some aspects, careful inspection is needed to identify those snaketails.

Description of Habitat/Range:

Found in Wisconsin and Iowa, Sioux snaketail likes rivers and streams that are sand-bottomed. It is only known from a handful of counties in western Wisconsin.

Flight Season:

Late May to early July in Wisconsin.


Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
19%
(22)
76%
(90)
4%
(5)
1%
(1)
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.
View user-submitted photos

(Click on photos to enlarge)
Photo of Male Sioux snaketail
Male Sioux snaketail. © Dan Jackson

Male Sioux snaketail
Photo of Male Sioux snaketail
Male Sioux snaketail. © Dan Jackson

Male Sioux snaketail
Photo of Male Sioux snaketail
Male Sioux snaketail. © Dennis Paulson

Male Sioux snaketail
Photo of Female Sioux snaketail
Female Sioux snaketail. © Dan Jackson

Female Sioux snaketail
Photo of Female Sioux snaketail
Female Sioux snaketail. © Dan Jackson

Female Sioux snaketail
Photo of Female Sioux snaketail
Female Sioux snaketail. © Dan Jackson

Female Sioux snaketail



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