shadow darner

(Aeshna umbrosa)

               
Conservation Status

IUCN Red List

LC - Least Concern

shadow darner

NatureServe

N5 - Secure

SNR - Unranked

Minnesota

not listed

Occurrence

Common and widespread in Minnesota

Flight/Season

Late June to late October

Habitat

Shaded areas alongside slow streams, ponds, and swamps; ditches.

Size

2¾ to 3

   
   

Identification

This is a common and widespread, 2¾ to 3 long, mosaic darner (genus Aeshna). It is found throughout North America except in the arid southwest and, for some reason, Newfoundland. It is a late-season dragonfly. Only the autumn meadowhawk (Sympetrum vicinum) flies later in the year.

The face is pale grayish-green and lacks the black horizontal stripe found on many other species of dragonflies. There is a black T-shaped spot on the upper part of the face (frons) below where the eyes meet. The lower leg of the T spot is slightly constricted in the middle. The compound eyes meet along a long margin at the top of the head. The lower back of the head is brown.

The thorax is brown with two shoulder (dorsal) stripes and a pair of side stripes on each side. The shoulder stripes are blue. The side stripes are parallel and greenish-yellow for most of their length, fading to bluish-green at the top. The front (anterior) stripe is straight and complete, not bent, notched, or interrupted. The bottom widens slightly and there is a small rearward extension at the top.

The abdomen is brownish-black and slender. Abdominal segment 3 is elongated and noticeably constricted when viewed from above. Abdominal segments 1 through 9 have a pair of pale blue spots on the upper (dorsal) surface that get darker in cool weather. Abdominal segment 10 on the male is unmarked. These spots are narrower than those on other blue darners. The pale areas on the underside on the abdomen are large, bright, and green on the eastern subspecies, blue on the western subspecies. Females are usually colored similar to males but there is a rare green form female with green dorsal spots on the abdomen.

On the male the pair of appendages at the end of the abdomen (cerci) are expanded at the tip and twisted downward. They appear wedge-shaped when viewed from the side.

The wingspan is about 3 to 4. The wings are clear. The forewings are slightly narrower than the hindwings.

 
Similar
Species

Lance-tipped darner (Aeshna constricta) front thoracic stripe is slightly notched in the middle. The abdomen has larger blue dorsal spots, normal for darners. The cerci are darker. It flies in open sunlight.


Larval Food

Mostly aquatic insect larvae, but also freshwater shrimp, tadpoles and small fish.

 
Adult Food

Mosquitoes, midges, other dragonflies, moths, grasshoppers, beetles, and any other insects smaller than themselves.

 
Life Cycle

The female deposits eggs either in wet rotting wood of a floating or submerged log or inside the stem of emergent vegetation. The eggs hatch about a week later or, in harsher climates, enter a period of decreased metabolic activity (diapause) that lasts up to 7 months. The hatched larva (naiad) grows to be 1½ to 1¾ long. In Minnesota it usually takes a year for a naiad to mature and emerge as an adult. In warmer climates the naiad matures in about 2 months. In colder climates it may take several years. Most adults live for about 2 weeks, though those who endure a harsh winter as a naiad may live 2 months or more.

 
Behavior

Adults hunt mostly in the shade and mostly at dusk.


Distribution Distribution Map  

Sources: 7, 17, 18, 27, 29.


Comments

 


Taxonomy

Order:

Odonata (dragonflies and damselflies)

 

Suborder:

Epiprocta

 

Infraorder:

Anisoptera (dragonflies)

 

Superfamily:

Aeshnoidea

 

Family:

Aeshnidae (darners)

 
Subordinate Taxa

eastern shadow darner (Aeshna umbrosa umbrosa)

western shadow darner (Aeshna umbrosa occidentalis)

 
Synonyms

Aeschna umbrosa

 
Common
Names

shadow darner


 

 

 

 

 

 

Glossary

Cercus

One of a pair of small sensory appendages at the end of the abdomen of many insects and other arthropods. In Odonata, one of the upper pair of claspers. Plural: cerci.

 

Diapause

A period of decreased metabolic activity and suspended development.

 

Frons

The upper part of an insect’s face, roughly corresponding to the forehead.

 

Naiad

The aquatic larval form (nymph) of a dragonfly, mayfly, or stonefly.

 

 

 

 

 

       

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  shadow darner   shadow darner
       
       
       

 

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  Shadow Darner
DianesDigitals
 
  Shadow Darner  
 
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  Shadow Darner (Aeshna umbrosa)
Bill Keim
 
  Shadow Darner (Aeshna umbrosa)  
     
  Aeshna umbrosa (Shadow Darner)
Allen Chartier
 
  Aeshna umbrosa (Shadow Darner)  

 

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  Shadow Darner - September 14, 2014
Don Gagnon
 
   
 
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Published on Sep 15, 2014

Shadow Darner (Aeshna umbrosa), Perched on Colorado Blue Spruce (Picea pungens) branch, Gagnon Wildlife Habitat, Somerset, Massachusetts, Sunday morning, September 14, 2014, 9:28 AM - Panasonic Lumix DMC-FZ70 00710; 40 sec.

 
     
  042
stickadk
 
   
 
About

Published on Jan 11, 2013

Dec. 5, 2012, Temps low 50's down to 47, raining, Lake Placid, NY Found this aesha, (darner) species of dragonfly swimming around in 1" of water over the ice. Believe it is Aeshna umbrosa, (Shadow Darner), as that is the only aeshna species to have emerged from my female-made vernal pond. We figure is does this due to lack of oxygen in the pond at this time of year. I've seen this happen before this year, but only took photos.

 
     
  Shadow Darner Hovers
James Walker
 
   
 
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Uploaded on Mar 27, 2011

September 28, 2010
Cranberry Lake
Anacortes, WA
(1/8 normal speed)

A Shadow Darner hovers near me -- in the shadows.

 
     
  Shadow Darner Dragonfly
Doris Dumrauf
 
   
 
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Published on Nov 19, 2014

A shadow darner dragonfly flies over our pond in search of insects

 
     
  MVI 080511 shadow darner
stormyeyes99
 
   
 
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Uploaded on Aug 8, 2011

hadow Darner ovipositing on the evening of August 5, 2011

 
     

 

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