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Diptera.info :: Identification queries :: Diptera (eggs, larvae, pupae)
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Activity in lake mud
Keith Short
#1 Print Post
Posted on 30-09-2016 11:45
Member

Location: Loves Park, Illinois, USA
Posts: 37
Joined: 10.07.12

I have been searching the margins of a local lake for the larvae/pupae of Tachytrechus vorax, a dolichopodidae species.

I have not had great success. I started my search in late August when many adults were present on the thin sand beach on one side of the lake. I brought home some lake mud scraped from a small section of the beach and have been observing it carefully. There is not much activity to observe in "real time" but time lapse movies of the mud have helped me realize how incredibly active the mud actually is.

Here is a link to a Youtube movie of the small lake recreation that has been "living" in my garage fro the past 7 weeks.
I photograph at ~ 1 frame every 15 seconds and the movie was stitched together with 15 frames per second. This 1 minute movie represents several hours of activity in a small section of the paint-roller pan "lake".

The only larvae that I have approximately identified are crane fly larvae and soldier fly larvae. The video is best viewed with "high def" settings.

https://youtu.be/...

Keith
 
Keith Short
#2 Print Post
Posted on 30-09-2016 11:51
Member

Location: Loves Park, Illinois, USA
Posts: 37
Joined: 10.07.12

And the second video which I probably should have posted first as it shows the setup for making the movie.

https://www.youtu...mZoSVW7AaA

Keith
 
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Some flies preserved in ethanol and then pinned often get the eyes sunken, how can this be avoided? Best answer: I usually keep alcohol-collected material in alcohol

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Aneomochtherus

17.08.23 13:54
Tony, I HAD a blank in the file name. Sorry!

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Tony, thanks! I tried it (see "Cylindromyia" Wink but don't see the image in the post.

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pjt - just send the post and attached image. Do not preview thread, as this will lose the link to the image,

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Tried to attach an image to a forum post. jpg, 32kB, 72dpi, no blanks, ... File name is correctly displayed, but when I click "Preview Thread" it just vanishes. Help!

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