racket-tailed emerald

(Dorocordulia libera)

               
Conservation Status

IUCN Red List

not yet assessed

racket-tailed emerald

NatureServe

N5 - Secure

SNR - Unranked

Minnesota

not listed

Occurrence

Fairly common

Flight/Season

Early June to mid-August

Habitat

Small lakes, ponds, lake coves, and slow streams with boggy edges.

Size

1 to 1 long

 

Identification

This is a fairly common, small, slender, 1 to 1 long emerald.

The thorax is dark brown and metallic green with no vertical stripes on the sides. It is densely covered with brown hairs.

The abdomen is long, slender, and black. There are no spots on the upper (dorsal) surface. The base of the abdominal segment 3 has a yellow ring around it that is uneven in width, wider at the base, forming a lower lateral basal spot. On the male, abdominal segments 7 through 9 are greatly expanded and somewhat flattened horizontally, forming a flat club. On the female, segments 7 through 9 are only slightly expanded.

The wings are long, slender, and clear except for a black stigma at the leading edge of each wing and sometimes a small amber-tinted patch near the base. The forewing triangle does not have a cross vein.

The eyes are bright green and are in contact at the top of the head. The face is metallic green.

The legs are black.

 
Similar
Species

American emerald (Cordulia shurtleffii) is larger, up to 1 long. The ring around the base of abdominal segment 3 is narrow and even in width. The forewing triangle has a cross vein.


Naiad Food

 

 
Adult Food

 

 
Life Cycle

 

 
Behavior

 


Distribution Distribution Map  

Sources: 7, 16, 17, 18.


Comments

 


Taxonomy

Order:

Odonata (dragonflies and damselflies)

 

Suborder:

Epiprocta

 

Infraorder:

Anisoptera (dragonflies)

 

Superfamily:

Cavilabiata

 

Family:

Corduliidae (emeralds)

 

Subfamily:

Corduliinae

 
Synonyms

 

 
Common
Names

racket-tailed emerald


 

 

 

 

 

Glossary

stigma

In plants, the portion of the female part of the flower that is receptive to pollen. In Odonata and Hymenoptera, a blood-filled blister or dark spot at the leading edge of each wing toward the tip, thought to dampen wing vibrations and signal mates. In Lepidoptera, an area of specialized scent scales on the forewing of some skippers, hairstreaks, and moths.

 

 

 

 

 

       

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  racket-tailed emerald   racket-tailed emerald
       
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  Dorocordulia libera (Racket-tailed Emerald)
Allen Chartier
 
  Dorocordulia libera (Racket-tailed Emerald)  

 

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  Racket-tailed Emerald Dragonfly (Corduliidae: Dorocordulia libera) on Grass Blade
Carl Barrentine
 
   
 
About

Uploaded on Jul 2, 2011

Photographed at the Rydell NWR, Minnesota (29 June 2011).

 
     

 

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