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Thread: photo of a predaceous diving beetle

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    photo of a predaceous diving beetle

    Hi all,

    I only just noticed that there was a forum for creepy-crawlies on this site...yay! I have only been posting photos of CPs up until now!

    I added this photo of a predaceous diving beetle on my blog the other night, along with a couple of other photos and an explanation of how I took it.

    Cheers
    EC
    www.macrocritters.wordpress.com


    water beetle at surface copyright Ernie Cooper by ernie.cooper, on Flickr

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    mass's Avatar
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    hm. Great pic.

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    Really nice site and write up about the diving beetle setup!

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    kulamauiman's Avatar
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    great pic. However I think it is a hydrophilidae (water scavanger beetle) rather than a dyticidae (predaceous diving beetle) unless of course they have merged the two families (taxonomists). This side view provides a nice view of the meso sternum and can see a spine that runs from the meso sternum to abdomen. Classic morphological character for the hydrophilids. Behavior wise did it swim like a frog (pairs of legs working together) or like it was running in the water?

    very nice pic that it can allow me to see that detail.

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    Quote Originally Posted by mass View Post
    hm. Great pic.
    Thank you!

    EC
    www.macrocritters.wordpress.com

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    Quote Originally Posted by swords View Post
    Really nice site and write up about the diving beetle setup!
    Thanks, I really appreciate that!

    EC
    www.macrocritters.wordpress.com

  7. #7

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    Quote Originally Posted by kulamauiman View Post
    great pic. However I think it is a hydrophilidae (water scavanger beetle) rather than a dyticidae (predaceous diving beetle) unless of course they have merged the two families (taxonomists). This side view provides a nice view of the meso sternum and can see a spine that runs from the meso sternum to abdomen. Classic morphological character for the hydrophilids. Behavior wise did it swim like a frog (pairs of legs working together) or like it was running in the water?

    very nice pic that it can allow me to see that detail.
    Thanks for the response! It is always nice to hear from someone that knows what they are talking about. That being said, I really thought it was a predaceous diving beetle, but I am certainly no expert. I thought it was swimming like rowing a boat, but to tell the truth, now that I have watched again I can’t tell for sure…it is moving too fast. I see the structure you are talking about. Tomorrow why don’t I see about taking a good photo of its ventral surface and post it for you to take a look at?

    EC
    www.macrocritters.wordpress.com


    Thanks for the response...

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    kulamauiman's Avatar
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    pic here illustrates the spine
    http://thingsbiological.wordpress.co...hydrophilidae/

    maybe this guy?
    Tropisternus collaris (Fabricius) - Tropisternus collaris
    http://bugguide.net/node/view/416372


    However I do not see clubbed antenna so am now guessing again. Clubbed antenna are another diagnostic character for this group...

    but I dunno squat about mainland beetles. All new things for me to learn about. Odd thing about this family of beetles in Hawaii is we apparently have a few that are terrestrial just to mess up the minds of general entomology students......

    Just wish the many people wanting me to do quick ids of their insects could post such high quality, clear pictures. Most I have gotten are blobs with legs or antenna sticking out of them. I can probably do an count of antennal segments on the ant pics on your web site.
    Last edited by kulamauiman; 07-17-2012 at 10:39 PM.

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