Wisconsin Odonata Survey

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Cordulegaster maculata  Selys, 1854
Twin-spotted Spiketail


Cordulegastridae, Spiketail Family

Status-Global/State:

Global: G5     Wisconsin: S4    

Distinguishing Characteristics:

This large black dragonfly varies from 2.5 to 3.0 inches in the body length. The abdomen has short yellow spots in separated pairs along its length. The forehead is yellow in males and brown in females with sea-green eyes. The female is similar to the male. The male's abdomen is slightly clubbed while the female ovipositor (appendages at end of the abdomen) extends the length of a segment beyond the abdomen.

Description of Habitat/Range:

Common throughout eastern United States and southeastern Canada, this species is found at clear streams or small rivers in the woods. Sometimes it can be seen foraging miles away from larval habitats. It is fairly common throughout the northern two-thirds of Wisconsin.

Flight Season:

Late May to mid-August in Wisconsin.


Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
9%
(25)
69%
(191)
18%
(51)
3%
(8)
<1%
(1)
<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 twin-spotted spiketail
Male twin-spotted spiketail. © Dan Jackson

Male twin-spotted spiketail
Photo of Male twin-spotted spiketail
Male twin-spotted spiketail. © Dan Jackson

Male twin-spotted spiketail
Photo of Female twin-spotted spiketail
Female twin-spotted spiketail. © Dan Jackson

Female twin-spotted spiketail
Photo of Female twin-spotted spiketail
Female twin-spotted spiketail. © Ryan Brady

Female twin-spotted spiketail



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