eastern forktail

(Ischnura verticalis)

               
Conservation Status

IUCN Red List

LC - Least Concern

eastern forktail

 

NatureServe

N5 - Secure

SNR - Unranked

Minnesota

not listed

Occurrence

Widespread and very common. Abundant in Minnesota.

Flight/Season

Late May to early October

Habitat

Ponds, marshes, slow streams, and other wetlands

Photo by Alfredo Colon
Size

Total Length: to 13 16 (22 to 30 mm)

 

Identification

Eastern forktail is a small, narrow-winged damselfly. It occurs east of the Rocky Mountains from Quebec and Georgia in the east to Manitoba and New Mexico in the west. It is very common in the northeast and Midwest, present but uncommon in the southern tier of states. It is abundant in Minnesota, where it has been reported in 81 of the state’s 87 counties.

Adults are to 13 16 (22 to 30 mm) long.

On the male, the face is green. The top of the head is black. The compound eyes are mostly green, black just on the top. There is a small, bright green, circular spot (postocular spot) behind each eye. The spots are not connected by a bar.

The thorax is black with narrow green shoulder stripes and pale green sides. The stripe is often narrowest at its length. On rare individuals, the stripe is broken, as it is on the closely related fragile forktail.

The abdomen is very slender and mostly black, with a pale, very narrow ring at the tip of each segment. Abdominal segments 8 and 9 are bright blue above and below, but on the sides they are black on the leading half and bright blue on the apical half. There is a forked projection on the upper side of segment 10 that gives this genus the common name forktails. The projection is blunt and is forked for half of its length. It points more upward than rearward, and does not extend beyond the tip of segment 10. The projection is too small to be used as a field mark, but may be discernible in photos.

The wings are clear and are distinctly narrowed (stalked) at the base. There are only two cross veins between the base of the wing and the wing notch (nodus). The median vein intersection, where the M3 vein rises to meet the M1 vein, occurs after the nodus, closer to the nodus than the basal cross vein (arculus).

The legs are short and armed with spines. They are black above and on the sides, pale blue below.

Immature females are black with orange markings. Abdominal segment 2 and the basal half of segment 3 are orange. Segments 4 through 10 are black. The back of the head, the postocular spots, and the legs are orange.

Mature females are entirely covered with a pale blue powdery bloom (pruinose), obscuring any black or blue markings that may or may not be there. The postocular spots are pale blue and are larger.

 
Similar
Species

 


Larval Food

 

 
Adult Food

Flying insects

 
Life Cycle

 

 
Behavior

Eastern forktail is a weak flier and is usually found low in vegetation. The wings are held together above the body when at rest.


Distribution Distribution Map  

Sources: 7, 18, 24, 27, 29, 30, 72.


Comments

 


Taxonomy

Order:

Odonata (dragonflies and damselflies)

 

Suborder:

Zygoptera (damselflies)

 

Superfamily:

Coenagrionoidea

 

Family:

Coenagrionidae (narrow-winged damselflies)

 
Synonyms

 

 
Common
Names

eastern forktail


 

 

 

 

 

 

Glossary

Pruinescence

A waxy or powdery bloom that covers the underlying coloration and gives a dusty or frosty appearance.

 

 

 

 

 

       

Visitor Photos

   
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Alfredo Colon


Adult Male

  eastern forktail    
       

Adult Female

  eastern forktail   eastern forktail
       
  eastern forktail    
       

Immature Female

  eastern forktail    
       

       
       
       

MinnesotaSeasons.com Photos

   

Adult Male

Rare form male with broken shoulder stripes

  eastern forktail    
       
       

 

Camera

     

Slideshows

   
  Eastern Forktail (Ischnura verticalis)
Bill Keim
 
  Eastern Forktail (Ischnura verticalis)  
     
  Eastern Forktail (Ischnura verticalis)
Andree Reno Sanborn
 
  Eastern Forktail (Ischnura verticalis)  

 

slideshow

     

Visitor Videos

   
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Other Videos

 
  Eastern Forktail (Coenagrionidae: Ischnura verticalis) Male Resting
Carl Barrentine
 
   
 
About

Published on Aug 7, 2010

Photographed at Itasca State Park, Minnesota (06 August 2010).

 
     
  Eastern Forktail (Coenagrionidae: Ischnura verticalis) Male Tail-flipping Behavior
Carl Barrentine
 
   
 
About

Published on Aug 7, 2010

Photographed at Itasca State Park, Minnesota (06 August 2010).

 
     
  Ischnura verticalis
DocBebitte
 
   
 
About

Published on Dec 1, 2018

Agrion vertical (Ischnura verticalis) en train de manger une proie.

Google Translation: Agrion vertical (Ischnura verticalis) eating prey.

 
     
  Eastern Forktail Damselflies (Coenagrionidae: Ischnura verticalis) on Twig
Carl Barrentine
 
   
 
About

Published on Aug 9, 2011

Immature female (left) and adult male (right). Photographed in Wisconsin, just across the Mississippi River from Red Wing, Minnesota (04 August 2011) Thank you to John and Jane Balaban (@Bugguide.net) for indentifying the sex and identity of these specimens.

 
     

 

Camcorder

         

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Alfredo Colon
9/6/2018

Location: Woodbury, Minnesota

eastern forktail


Alfredo Colon
7/31/2018

Location: Woodbury, Minnesota

eastern forktail


     
     
 

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