Wisconsin Odonata Survey

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Basiaeschna janata  (Say, 1839)
Springtime Darner


Aeshnidae, Darner Family

The genus Basiaeschna contains just one species, the springtime darner, that is similar to a small mosaic darner but with simpler wing venation, smaller eyes and a very early flight period.

Status-Global/State:

Global: G5     Wisconsin: S4    

Distinguishing Characteristics:

A small darner looking much like a mosaic darner, but seen early in spring, is likely to be this species. Both genders have a small brown spot at the base of each wing and thoracic side stripes that are mostly bright yellow to whitish (which on males contrast markedly with blue spots on the abdomen). Males have simple, narrow, paddle-type claspers; females have long, narrow cerci.

Description of Habitat/Range:

Common throughout much of the eastern and central United States and southeastern Canada, this species prefers gently flowing rivers and streams in forested areas, also some ponds and lakes, usually clear. It is widely distributed in Wisconsin.

Flight Season:

Late April to mid-July in Wisconsin. Early flight period is distinctive making it not just an early darner, but among the earliest of Wisconsin's spring species of Odonata.


Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
31%
(230)
64%
(475)
5%
(36)
<1%
(3)
<1%
(2)
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 springtime darner
Male springtime darner. © Andy Paulios

Male springtime darner
Photo of Male springtime darner
Male springtime darner. © Dan Jackson

Male springtime darner
Photo of Male springtime darner
Male springtime darner. © Dan Jackson

Male springtime darner
Photo of Female springtime darner
Female springtime darner. © Dan Jackson

Female springtime darner
Photo of Female springtime darner
Female springtime darner. © Ryan Brady

Female springtime darner
Photo of Female springtime darner
Female springtime darner. © Dan Jackson

Female springtime darner



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