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Previous Sightings by Mardon

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Thumbnail ImageFly on September 22, 2013
Thumbnail ImageAnt on June 03, 2014
Thumbnail ImageMiridae on July 24, 2013
Thumbnail ImageMoth on July 20, 2013


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Contributors » Mardon » Beetle

Beetle discovered by Mardon (#2783)

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Sighting Info

Observed: July 12, 2014 @ 4:30 PM
Posted on: July 13, 2014 @ 12:57 PM (diff: 1 days)
Lots of these were zigzagging furiously along the water surface of a bog hole. Sometimes they would swim under the water but mostly on the top. I netted one for the photos and put it back after. The whitish 'tail' was very noticeable as it reflected the sun.

Newfoundland Nature

Sighting's Features

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Newfoundland Nature

Sighting's Identification

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Newfoundland Nature

Newfoundland Nature

Comments by Site Members (scroll to post comment)

By Barry Hicks on 7/13/2014 5:53:52 PM


Excellent photo as usual.  This is a whirligig beetle (Family Gyrinidae, genus Gyrinus). Newfoundland has 10 species according to Majka and Kenner 2009.   An interesting fact about these beetles is that they have 4 compound eyes.  2 for above water and 2 below water. 

By Mardon on 7/14/2014 10:27:30 AM

Thanks Barry.  I did not know about the four compound eyes.  Now that you've mentioned it, there is one photo where I can see an eye above the water line and another eye below the water line. Interesting!  I also find it interesting that with these tiny aquatic animals, there is generally enough surface tension in a drop of water on a plastic surface that the drop remains large enough for most of these tiny organisms to actually swim in the water bubble.  That was the case with this beetle.  Kind of crazy.  Mardon

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