Enallagma annexum

(Hagen, 1861)

Northern Bluet

Enallagma annexum, the northern bluet, is a small in the Coenagrionidae. It was formerly considered with Enallagma cyathigerum but is now recognized as a distinct . The species exhibits in coloration, with males displaying blue thoracic and abdominal coloration and females showing greenish-yellow to brown tones.

Enallagma annexum by the Smithsonian. Used under a CC0 license.Enallagma annexum by the Smithsonian. Used under a CC0 license.Northern Bluet, male by D. Gordon E. Robertson. Used under a CC BY-SA 3.0 license.

Pronunciation

How to pronounce Enallagma annexum: //ɛˈnæ.ləɡ.mə ænˈnɛk.səm//

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

measure 26–40 mm in length. Males have blue sides of the and blue upper surface of the ; lower abdominal appendages are longer than upper appendages. Females are greenish-yellow to brown with a mostly black upper abdomen. Distinguished from the familiar bluet (Enallagma civile) by large postocular spots and shorter . Shares with the boreal bluet (Enallagma boreale) the combination of large eyespots and a mushroom-shaped black spot on abdominal segment S2, best viewed dorsally.

Images

Distribution

North America; recorded from Vermont and other regions of the United States.

Seasonality

season from early May to July.

Similar Taxa

  • Enallagma civileSimilar appearance; distinguished by large postocular spots and shorter in E. annexum
  • Enallagma borealeShares large eyespots and mushroom-shaped black spot on S2; requires careful examination to separate

Tags

Sources and further reading