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Anax junius
Common Green Darner

(Drury, 1773)
Aeshnidae, Darner Family
photo of Male common green darner
Male common green darner — Dan Jackson
The green darners (genus Anax) are large, robust, strong-flying and often migratory. Two species are known to occur in Wisconsin, one is very common, the other rare and possibly just an accidental stray. Both are easy to identify, even in flight.
Status-Global/State:
Global: G5 Wisconsin: S5
Distinguishing Characteristics:
This large, strong-flying darner is readily distinguished by a solid green thorax, largely blue abdomen (males) or reddish-brown abdomen (females), and a distinctive "bulls-eye" pattern on the forehead of both genders that is easily visible from above. All ages have a dark stripe on top of the abdomen that widens towards the tip. Comet darner is most similar, but the male of that species has a bright red abdomen. Though females of the two species are somewhat similarly colored, separate them by the presence of "bulls-eye" mark on forehead and dark stripe on top of the abdomen of common green darner (female comet darner lacks both marks). A useful identification clue sometimes seen even at a distance – pairs usually oviposit in tandem which is a unique behavior among North American darners.
Description of Habitat/Range:
Widespread and common from southern Canada to Mexico, this species is found at a variety of still and slow-flowing waters, including marshes, small ponds (may be semi-permanent), lakes, sheltered bays, and slow streams. Preferred habitats often lack centrarchid fishes (primarily sunfishes [genus Lepomis] and black basses [genus Micropterus]).
Flight Season:
This species is one of our few truly migratory dragonflies with a long and early flight period, but with a resident (non-migratory) component of the population as well. Spring migrants usually start to arrive from the south in early April. Reproduction occurs upon arrival, nymph growth rates are typically fast, and new adults emerge in late summer. Large numbers of young adults are often seen migrating south through Wisconsin in late August and September.
(Click on photos to enlarge)
photo of Male common green darner
Male common green darner — Dan Jackson
photo of Male common green darner
Male common green darner — Dan Jackson
photo of Male common green darner in flight
Male common green darner in flight — Dan Jackson
photo of Immature male common green darner
Immature male common green darner — Dan Jackson
photo of Immature male common green darner
Immature male common green darner — Dan Jackson
photo of Close-up of male common green darner thorax
Close-up of male common green darner thorax — Dan Jackson
photo of Close-up of male common green darner face
Close-up of male common green darner face — Dan Jackson
photo of Side (top image) and top view of male common green darner cerci
Side (top image) and top view of male common green darner cerci — Dan Jackson
photo of Female common green darner
Female common green darner — Dan Jackson
photo of Immature female common green darner
Immature female common green darner — Dan Jackson
photo of Close-up of immature common green darner
Close-up of immature common green darner — Dan Jackson
photo of Immature female common green darner
Immature female common green darner — Dan Jackson
photo of Common green darner pair in wheel
Common green darner pair in wheel — Dan Jackson
photo of Common green darner pair
Common green darner pair — Vic Berardi
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