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Flag Footed Fly

 
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BugEZ



Joined: 26 Mar 2011
Posts: 649
Location: Loves Park Illinois

PostPosted: Sat Jan 06, 2018 5:37 pm    Post subject: Flag Footed Fly Reply with quote

Some long legged fly species (dolichopodidae) have ornamentation on their feet. The males use these markers somehow in courtship to display to the females that they have the right stuff. A typical male may look like this (image from BugGuide)

https://bugguide.net/node/view/659439

I found this specimen in my "winter reserve" in the freezer. I had to give it a bath to rehydrate the eyes, but but eye rehydration was only partially successful.
The feet proved to be more interesting. What high contrast between white and black patches!

The whole body shot using my rig with LED bucket light, 29mm UKA lens on extension, ~ 200 images, Pentax K-01 mirrorless camera.

The foot shots with my 10X OLY, 300mm Pentax 55-300mm zoom as tube lens, Pentax K-01 mirrorless camera, bucket LED lighting. about 30 images each for the two foot poses.

Processed with Zerene Pmax. Zerene generated the stereos, but I passed them through Stereo Photo Maker then down sized with Photoshop to lower file size.

All images




Keith
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 18352
Location: Richland, Washington State, USA

PostPosted: Sat Jan 06, 2018 8:20 pm    Post subject: Reply with quote

Lovely!

You know I'm a sucker for stereo in general, but this one of those cases where it helps a lot for understanding.

Without stereo, I have a lot of trouble deciphering the structure in the first image, because of the way the critter's left foot lines up with the middle of his right leg. But with stereo, it's pretty simple.

Then in the other two, the stereo makes clear how the spines and bristles relate to the rest of the foot.

I don't think that I've ever seen one of these flies in person, so I also appreciate the up-close introduction.

--Rik
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BugEZ



Joined: 26 Mar 2011
Posts: 649
Location: Loves Park Illinois

PostPosted: Sat Jan 06, 2018 9:27 pm    Post subject: Reply with quote

Thanks Rik!

Yes the stereo helps solve the tangled leg mystery of what is where.

These Dolichopus genus flies I find beside a stream near my home in July. I think they only do one generation per year as I don’t see them in other summer months. On similar long legged Tachytrechus flies that I find beside a lake 1/4 mile away, the males have black spots on the tips of the wings. The Condylostylus doli that I find in my yard all summer long don’t have such obvious flags (to us). As several different related Condylostylus species co exist on my hosta leaves at the same time, they must have a different mating authentication scheme. Doli flies have solved the species verification check many ways.

Keith.
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BugEZ



Joined: 26 Mar 2011
Posts: 649
Location: Loves Park Illinois

PostPosted: Thu Jan 11, 2018 8:04 am    Post subject: Reply with quote

some photos of the foot with green background .






Keith
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