Wisconsin Odonata Survey

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Ophiogomphus susbehcha  Vogt and Smith, 1993
St. Croix Snaketail


Gomphidae, Clubtail Family
"Most Wanted" Species

Status-Global/State:

Global: G2     Wisconsin: S2     Endangered

Distinguishing Characteristics:

The recently described St. Croix snaketail averages about 2.0 inches in length. The thorax is blue-green with black shoulder stripes and two stripes on the thorax. The eyes are gray-blue. The legs are black except at base. The abdomen is black with yellow markings, with the tip yellow. Ophiogomphus species are very similar to each other in some aspects, careful inspection is needed to identify those snaketails.

Description of Habitat/Range:

The St. Croix snaketail is limited to Wisconsin and parts of Minnesota, especially along the St. Croix River drainage. It prefers medium-sized rivers that are clear, fast-flowing with mixed gravel, sand, and rock bottoms.

Flight Season:

Mid-May to late June in Wisconsin.


Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
32%
(268)
68%
(574)
<1%
(4)
<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 St. Croix snaketail
Male St. Croix snaketail. © Matt Berg

Male St. Croix snaketail
Photo of Male St. Croix snaketail
Male St. Croix snaketail. © Matt Berg

Male St. Croix snaketail
Photo of Close-up of thorax of male St. Croix snaketail
Close-up of thorax of male St. Croix snaketail. © W.A. Smith

Close-up of thorax of male St. Croix snaketail
Photo of Female St. Croix snaketail
Female St. Croix snaketail. © Dan Jackson

Female St. Croix snaketail
Photo of Female St. Croix snaketail
Female St. Croix snaketail. © W.A. Smith

Female St. Croix snaketail



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