Double-striped bluet

Enallagma basidens

The double-striped bluet is a species of damselfly in the family Coenagrionidae. This species grows to lengths 21–28 mm. Its common name comes from the peculiar black shoulder stripe, which is divided in two by a thin blue stripe. This is the key identification characteristic; no other damselfly has a shoulder stripe that looks like this one.
Double-striped Bluet (Enallagma basidens)  At a 365 + 395nm UV light setup at a mixed forest edge.  Double-striped bluet,Enallagma basidens,Geotagged,Summer,United States

Appearance

Mature males have an abdomen that alternates black and blue. The final segment of the abdomen is blue below and black above, while segments 8 and 9 are all blue. Females and immatures are tan to olive or brown, but like the mature males they have the divided shoulder stripe.

Distribution

*United States:
⤷ Canada:

Habitat

These damselflies are most typically found alongside lakes and ponds, but are occasionally found next to slow-moving streams, too.

References:

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Taxonomy
KingdomAnimalia
DivisionArthropoda
ClassInsecta
OrderOdonata
FamilyCoenagrionidae
GenusEnallagma
SpeciesE. basidens