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Free images -  Insects - Alder Fly 
(Alderfly)

Note on large files:  Very large files may be bigger than your screen.  
Right click on any portion of the image showing and chose "save as".  

 

 

Alderflies belong to the megalopteran family Sialidae.  There are about 66 species.  Species identification is difficult.  There are 24 species of Sialis in the U.S. and Canada.  Sialis velata is the most widely distributed species in Canada.  

Alderflies have strong bodies with either a brown or black colour with long antennae. They have two pairs of brown or grey wings which fold back over their body when they are at rest, however, they are weak fliers.  Dark veins on the wings are prominent.  Take note of their three pairs of legs.

The larvae of this species are aquatic with large heads and powerful jaws.

Adults can be found during the months of May and June when they live for only 2 or 3 days and can be found near freshwater shorelines preferring to rest on Alder trees. The specimen below was photographed in mid-June in northern Ontario.  Adults do not feed.

After mating at night, females lay large batches of 200-500 dark brown eggs on plants that overhang the water.  After hatching, the larvae fall into the water crawling along the bottom of ponds and streams hunting other insects and worms.  After 1-2 years the larva leaves the water and digs into the nearby soil to pupate.  2-3 weeks later, adult alderflies emerge.

 

 

Alderfly - 1

Medium - 640 x 480  Right click on above image and chose "save as".

Large - 2202 x 1651  -  Still free, but now only available by email request.

 

 

Alderfly - 2

Medium - 640 x 480  Right click on above image and chose "save as".

Large - 3555 x 2666  -  Still free, but now only available by email request.

 

 

Alderfly - 3

Medium - 640 x 480  Right click on above image and chose "save as".

Large - 2729 x 2046  -  Still free, but now only available by email request.

 

 

Alderfly - 4

Medium - 640 x 480  Right click on above image and chose "save as".

Large - 1978 x 2636  -  Still free, but now only available by email request.

 

 

Alderfly - 5

Medium - 640 x 480  Right click on above image and chose "save as".

Large - 3456 x 2592  - Still free, but now only available by email request.

 

 

Alderfly - 6

Medium - 640 x 480  Right click on above image and chose "save as".

Large - 4608 x 3456  - Still free, but now only available by email request.

 

 

Alderfly - 7

Medium - 640 x 480  Right click on above image and chose "save as".

Large - 3550 x 2663  - Still free, but now only available by email request.

 

 

Alderfly - 8

Medium - 640 x 480  Right click on above image and chose "save as".

Large - 3762 x 2821  - Still free, but now only available by email request.

 

 

Alderfly - 9

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Large - 4608 x 3456  - Still free, but now only available by email request.

 

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If you'd like to drop me a note to let me know if any of these images have been useful, I'd love to hear from you. I'm curious to see if my snapshots have been of benefit to you in some way.  Also, I'd like to hear what kind of images you'd like to see more of. 

 

 


 

Are You Baffled 
by Bugs ?

Did you know...

That all insects are bugs, but not all bugs are insects!

 


"I dreamed
 I was a butterfly,
 flitting around 
in the sky; 
then I awoke.  
Now I wonder:  
Am I a man 
who dreamt 
of being a butterfly, 
or am I a butterfly
dreaming 
that I am a man?"

~ Chuang Tse ~
Chinese philosopher

 

Insects have 3 body parts:  a head, thorax and abdomen.  They also have six legs and two antennae.

Spiders and Scorpions have eight legs and are not considered insects!

 

According to some sources, the total number of insect species is somewhere between 15 and 30 million!

There are 900,000 known species in the world.

 

Insane About Insects ?

 

Did you know...

Scorpions can live for more than one year without eating!

 

Mosquitoes have 47 teeth, but only the female mosquitoe bites using it's proboscis.

Fireflies, sometimes called Lightningbugs, are not true bugs or flies.  They are beetles!

Every year, insects eat about one third of the world's food crops.

Only male crickets can chirp.  They will chirp faster in warm weather.  

Most insects hatch from eggs.

The average bed contains 2-6 million dust mites!

 

Are You An Enthusiastic
Entomologist ?

Did you know...

Every year, the average person eats several insects while sleeping.  

Insects breath through a complicated network of air tubes called tracheae that open along the sides of the insects body.

Nearly all insect growth involves metamorphosis.

The average housefly lives only two weeks!

A female ladybug lays about 1000 eggs in her lifetime.

Honeybees fly at a speed of 13-15 mph.

Even though spiders have eight eyes, they still can't see very well.

A cockroach can live up to 9 days without its head!

 

 

 

 

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