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#1 2017-10-26 12:52:04

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 932

A small bouncing cranefly.

I saw this cranefly land, then cling to the underside of a laurel leaf. The constant bouncing behaviour made photography extra difficult.
I have tried to ID, by comparing with previous images, but I don't seem to have seen this one before. Body-structure-wise, it seems to have similarities to a Molophilus species, but I'm sure the venation is wrong. Using the venation as a starting point, so far I haven't found anything convincing.

Another curiosity is what appears to be a droplet of water resting on the underside of the thorax. It must have arrived with it, so I thought it must be part of its routine, maybe together with the bouncing - it looks like a male to me. Any idea what is going on?
I have heard of craneflies that bounce, but I can't remember any association with particular species. I suppose I can't remember everything, which is my poor excuse!

Size - body length around 10 mm., or maybe a bit less.

Nigel G.


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#2 2017-10-26 20:27:56

Geoff F
DF Members
Name: Geoff Foale
From: South Devon
Registered: 2014-05-12
Posts: 172

Re: A small bouncing cranefly.

For what its worth . . . I have tried the keys and appear to end up at Dicranomyia (group 3) male. But I find that area to be difficult and mostly a microscope job !

However, some species are very localised or occur at a different time. I find D. autumnalis and modesta to be common and widespread.

Maybe one of our experts will appear with some better information before long.

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#3 2017-10-27 09:43:18

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 932

Re: A small bouncing cranefly.

That's worth quite a bit. Thanks Geoff.

I had actually looked at one of my previous ones, Dicranomyia modesta (almost 100pc !), and the venation was quite a bit different, so I thought I wasn't on the right lines at all. Yes, it does look to be in this area, but so far I've found little to use on the web that gets me anywhere.

The nearest I can get on the basis of venation is Neolimonia dumetorum, but even then there is a slight discepancy. Habitat very plausible though, mentioning rotting logs.

It would be interesting if anyone has any observations on craneflies apparently carrying water droplets.

Nigel.

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#4 2017-10-27 20:33:50

Geoff F
DF Members
Name: Geoff Foale
From: South Devon
Registered: 2014-05-12
Posts: 172

Re: A small bouncing cranefly.

As I understand the keys, Nigel, Neolimonia dumetorum has some obvious dark wing markings in addition to the stigma. Without additional markings leads to other Dicranomyia in Group 3. With variable stigma markings.

There are images of Neolimonia dumetorum, with distinctive wing markings, at the Catalogue of the Craneflies of the World website. See if this link works then use the search menu.

http://ccw.naturalis.nl/index.php

This more direct link may fail.

http://ccw.naturalis.nl/results.php

Last edited by Geoff F (2017-10-27 20:40:30)

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#5 2017-10-29 10:26:49

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 932

Re: A small bouncing cranefly.

Thanks for the links, Geoff.
I shall investigate further, but not optimistically!

Nigel.

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#6 2017-10-29 21:45:57

johnkramer
DF Members
Name: John Kramer
From: Oadby, Leicester
Registered: 2008-02-20
Posts: 233

Re: A small bouncing cranefly.

Hi Nigel.  This is a male Dicranomyia autumnalis.  You can see the posterior pair of downward pointing processes.
Best wishes, John K.

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#7 2017-10-29 23:52:31

Gateside
DF Members
Name: Nigel Gilligan
From: Cumbria
Registered: 2011-08-26
Posts: 932

Re: A small bouncing cranefly.

Thanks John. You saved me from suggesting another species, but at least I don't have to do that now.
I shall have to work out what I did wrong in the morning.

Nigel G.

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