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Borneo unusual fly and ant ID

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Old Sunday 25th August 2019, 16:23   #1
Jim M.
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Borneo unusual fly and ant ID

Can't even guess at the family for the fly – never seen anything remotely like it in the nearctic. The large ant is a puzzle too – check out the six large curved spines on the back and the shiny gold abdomen. Any help appreciated.
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Old Tuesday 27th August 2019, 07:51   #2
andyadcock
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The Ant seems to be of the family polyrhachis, possibly ypsilon?

https://www.agefotostock.com/age/en/...lyrhachis.html
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Old Wednesday 28th August 2019, 00:42   #3
Jim M.
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Thanks Andy. Looks like you nailed the genus of the ant--now only 600 species to choose from ;-). Still curious about the function of the spines; maybe just general defense from predators/enemies.
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Old Thursday 29th August 2019, 07:45   #4
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I would guess at family Micropezidae for the fly
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Old Friday 30th August 2019, 05:37   #5
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Quote:
Originally Posted by salticus View Post
I would guess at family Micropezidae for the fly
Thanks. Think you are correct. Members of the family (stilt-legged flies) are said to extend their front legs to mimic wasp antenna. While this one is not doing that in the photo, we can see the front legs have a pattern similar to what I've seen in the antenna of many similarly sized wasps: black overall with a medial white band.
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