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#1 2017-11-21 12:48:53

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 965

Cylindrotomidae - Diogma glabrata male, I think

I saw this on 26th July, and posted in a somewhat vague way as to species. I didn't get a response.
But having looked again, using the Craneflies of the world site:
http://ccw.naturalis.nl/results.php
I think it has to be Diogma glabrata, male.

It matches visually very well with the shown body features, and venation, and one or two of the images of a male match very well with the colour pattern too.

There is only one species in this genus in the UK.

The known habitat - wet woodland - matches well with where this one was found. Our wet garden (ex-marshland), plus being next to a strip of woodland lining a large drainage ditch.

I would be very surprised if this ID was incorrect, but it would be nice to get a nod in the right direction!

Nigel G.


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#2 2017-11-21 21:26:54

Geoff F
DF Members
Name: Geoff Foale
From: South Devon
Registered: 2014-05-12
Posts: 178

Re: Cylindrotomidae - Diogma glabrata male, I think

Running this through the keys I end up at the same position as you.

Only 3 wing veins running to the wing tip after the discal cell should rule out C. distinctissima where the upper vein starts forked and produces 4 veins

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#3 2017-11-21 21:53:55

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 965

Re: Cylindrotomidae - Diogma glabrata male, I think

Thanks Geoff.
I will admit (though it's obvious from my comments) that I didn't use a key. But I did use the venation comparison images on that site, and that looked very promising.

Nigel G.

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#4 2017-11-30 14:28:38

johnkramer
DF Members
Name: John Kramer
From: Oadby, Leicester
Registered: 2008-02-20
Posts: 243

Re: Cylindrotomidae - Diogma glabrata male, I think

Yes, D. glabrata it is.  A female.  The male has very distinct 'forcipate' claspers. 
John K

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#5 2017-11-30 19:58:10

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 965

Re: Cylindrotomidae - Diogma glabrata male, I think

Excellent! Thanks John.
On reflection, it was silly of me thinking it was a male, when it doesn't look like it's got proper claspers.  Although I've not come across ones that have a "tail" at least superficially intermediate between male and female.

Nigel G.

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