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#1 2018-09-14 14:14:14

mwoods
Registered user
Name: Michael Woods
From: Kent UK
Registered: 2018-07-24
Posts: 16

Longlegged pale fly

Hello,

Does anyone recognise this fly?  Photographed in September 2016 on the end of a log in a shaded area. I've turned the photo 90 degrees clockwise.  I'm tending towards Micropezidae solely on the grounds that it has tiny feet.

Thanks


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#2 2018-09-14 14:21:41

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 748

Re: Longlegged pale fly

Looks like a recently emerged Clusia flava (Clusiidae)

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#3 2018-09-14 18:48:13

mwoods
Registered user
Name: Michael Woods
From: Kent UK
Registered: 2018-07-24
Posts: 16

Re: Longlegged pale fly

Hello Tony,

Thanks for that. I've now found an almost exact match for my photo on the net, except that it has black front tarsi which I asume come with age.

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#4 2018-09-14 20:45:37

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 748

Re: Longlegged pale fly

I'm not absolutely certain about this, but I suspect that the black tarsi may be a feature of females - males tend to have paler front tarsi. But you are right in that colours will often darken with age

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#5 2018-09-15 00:01:57

mwoods
Registered user
Name: Michael Woods
From: Kent UK
Registered: 2018-07-24
Posts: 16

Re: Longlegged pale fly

Thanks again. I'm sure you're right but I'd also like to see another. These tantalising creatures appear for 30 seconds and disappear, I've had so many flies like this. Perhaps next year.................

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#6 2018-09-15 09:54:33

mwoods
Registered user
Name: Michael Woods
From: Kent UK
Registered: 2018-07-24
Posts: 16

Re: Longlegged pale fly

It appears that only the females have black front tarsi. Why?

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#7 2018-09-15 14:32:35

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 748

Re: Longlegged pale fly

Good question! - difficult to see what the selective advantage of black front tarsi in the female would be. There are plenty of flies, e.g. in Sciomyzidae and Ephydridae in which the front tarsi or legs are black, contrasting with pale mid and hind legs, but from memory, I would say that applies to both sexes. Whatever the behavioural advantage of black front legs is, it may be that in Clusia, that behaviour (feeding?; selection of oviposition site?) is more important to the females.

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#8 2018-09-17 19:35:29

mwoods
Registered user
Name: Michael Woods
From: Kent UK
Registered: 2018-07-24
Posts: 16

Re: Longlegged pale fly

Hello Tony,

What a prat I am. I have just discovered that I photographed a female only 2 days before! I had mis-identified it and parked it in a incorrectly named file never thinking to compare the two. Here it is perched on an Ash log on my woodpile black front tarsi and all. By the way my remark about " tending towards Micropezidae" was tongue in cheek.

Thanks for pointing me in the right direction.


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