Illinois river cruiser

(Macromia illinoiensis illinoiensis)

               
Conservation Status

IUCN Red List

not yet assessed Illinois river cruiser

NatureServe

N5 - Secure

Occurrence

Common

Flight/Season

Late June to early September

Habitat

Large lakes, large rivers, large streams

Size

1 to 3 long

 

 

 

 

 

 

 

 


Identification

This is a large, slender, 1 to 3 long dragonfly.

The thorax is dark brown on the sides and top, iridescent green in front. There is a single yellow vertical stripe on each side of the thorax and no vertical stripe on the front of the thorax. The ridge in front of each wing base (antealar carina) is yellow.

The abdomen is long, slender, and black with yellow spots. Abdominal segment 2 has a yellow ring around it that is interrupted at the top and at the sides. There is a pair of small spots on segments 3 and 4; no spots or very faint spots on segments 5 and 6; one large, conspicuous spot on abdominal segment 7; and often a pair of dash-like spots on segment 8. On the male, segments 7 through 10 are conspicuously swollen, forming a club.

The wings are long, slender, and clear except for a black stigma at the leading edge of each wing. Juveniles often have yellow-tinted wings. Some females have orangish-brown wingtips.

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

The legs are black.

 
Similar
Species

Georgia river cruiser (Macromia illinoiensis georgina) is the southern subspecies. It has a half-length yellow stripe in the front of the abdomen. The ring around abdominal segment 2 is continuous, not interrupted. There are conspicuous yellow spots on abdominal segments 3 through 8.


Naiad Food

 

 
Adult Food

 

 
Life Cycle

The female lacks an ovipositor, and must deposit her eggs by flying fast over the surface of the water and washing the eggs off of her body.

 
Behavior

 


Distribution Distribution Map  

Sources: 7, 16, 17, 18.

 


Comments

 


Taxonomy

Order:

Odonata (dragonflies and damselflies)

 

Suborder:

Epiprocta

 

Infraorder:

Anisoptera (dragonflies)

 

Superfamily:

Cavilabiata

 

Family:

Macromiidae (belted and river skimmers)

 
Synonyms

 

 
Common
Names

Illinois river cruiser

Swift river cruiser


 

 

 

 

 

 

 

 

Glossary

ovipositor

A long needle-like tube on the abdomens of some female insects, used to inject eggs into soil or plant stems.

 

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.

 

 

 

 

 

       

Visitor Photos

   
Share your photo of this insect.

       
       
       
       
       

MinnesotaSeasons.com Photos

   
  Illinois river cruiser   Illinois river cruiser
       
  Illinois river cruiser    
       
       

 

Camera

     

Slideshows

   
     
     
     

 

slideshow

     

Visitor Videos

   
Share your video of this insect.

     
     

Other Videos

 
     
     
     
     

 

Camcorder

         

Visitor Sightings

   
Share your sighting of this insect.

     
     
 

MinnesotaSeasons.com Sightings

   


 

 

Binoculars

Last Updated:

About Us | Privacy Policy | Contact Us | © 2017 MinnesotaSeasons.com. All rights reserved.