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#1 2015-04-02 22:48:13

Andrew Cunningham
DF Members
Name: Andrew Cunningham
From: Devon, UK.
Registered: 2010-11-05
Posts: 883

ID : Drosophila melanogaster?

Hello,

I have attached some images of a female specimen taken a few weeks ago in Devon and that I have since keyed out as Drosophila melanogaster. It is the first time I have come across this so I would appreciate confirmation or otherwise please.

Regards,
Andrew.


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Last edited by Andrew Cunningham (2015-04-02 22:48:41)

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#2 2015-04-04 15:09:21

JohnShowers
Committee
Name: John Showers
From: Northants
Registered: 2008-02-28
Posts: 65
Website

Re: ID : Drosophila melanogaster?

Hi Andrew,
There is now Drosophila suzukii to consider. This will key out to D. melanogaster in existing keys. The female suzukii has an oviscapt with teeth on the upper and lower margins to allow it to cut through the skin of soft fruit. There are identification details and photos in Dipterists Digest vol21 no. 2 Autumn 2014.

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#3 2015-04-04 22:05:52

Andrew Cunningham
DF Members
Name: Andrew Cunningham
From: Devon, UK.
Registered: 2010-11-05
Posts: 883

Re: ID : Drosophila melanogaster?

JohnShowers wrote:

Hi Andrew,
There is now Drosophila suzukii to consider. This will key out to D. melanogaster in existing keys. The female suzukii has an oviscapt with teeth on the upper and lower margins to allow it to cut through the skin of soft fruit. There are identification details and photos in Dipterists Digest vol21 no. 2 Autumn 2014.

Hello John,

Thanks for chipping in. My hopes were raised as I knew there were teeth present but they do not seem to fit for D. suzukii unfortunately so it carries on to the D. melanogaster group.

Regards,
Andrew.


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Last edited by Andrew Cunningham (2015-04-04 22:08:06)

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#4 2015-04-04 22:40:50

Andrew Cunningham
DF Members
Name: Andrew Cunningham
From: Devon, UK.
Registered: 2010-11-05
Posts: 883

Re: ID : Drosophila melanogaster?

Here's a better image showing that the teeth only run along the bottom edge.


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Last edited by Andrew Cunningham (2015-04-04 22:41:48)

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#5 2015-04-05 16:09:18

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 643

Re: ID : Drosophila melanogaster?

I'm inclined to say this is suzukii - compare your last image with http://upload.wikimedia.org/wikipedia/c … ulans2.jpg

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#6 2015-04-05 18:01:10

Andrew Cunningham
DF Members
Name: Andrew Cunningham
From: Devon, UK.
Registered: 2010-11-05
Posts: 883

Re: ID : Drosophila melanogaster?

Tony Irwin wrote:

I'm inclined to say this is suzukii - compare your last image with http://upload.wikimedia.org/wikipedia/c … ulans2.jpg

Thanks Tony.

I must confess that I struggle with the wording in Harris & Shaw (Digest Vol. 21 No. 2) that goes "Oviscapt dark brown, triangular, upper and lower margins with strong teeth...."

Whilst it initially looked a good match for D. suzukii to me, I couldn't see strong teeth on the upper margins. So, I think I have not grasped what is meant by this wording. I also struggled to see them in the illustration within said paper. Could someone explain please?

Regards,
Andrew.

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#7 2015-04-05 21:37:25

conopid
DF Members
Name: Nigel Jones
From: Shrewsbury
Registered: 2008-02-27
Posts: 630
Website

Re: ID : Drosophila melanogaster?

I noticed the missing upper teeth in the diagram too, and thought it must be an error in the text? Does anyone know what the key should say?


Nigel Jones
Shropshire

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#8 2015-04-05 22:04:06

Tony Irwin
DF Members
Name: Tony Irwin
From: Norwich
Registered: 2008-03-01
Posts: 643

Re: ID : Drosophila melanogaster?

Unlike the melanogaster group (melanogaster and simulans) which have a single row of teeth along the ventral and apical margin of the oviscapt, suzukii has an additional short row dorsally (shown nicely in http://www.scielo.br/img/revistas/rbent … html#fig11. However this more dorsal row is present in several of the obscura group too. So I'm not quite sure what is meant by this bit of the couplet. Without wishing to align myself with GWB, I do like books with pictures!

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#9 2015-04-07 22:39:14

Andrew Cunningham
DF Members
Name: Andrew Cunningham
From: Devon, UK.
Registered: 2010-11-05
Posts: 883

Re: ID : Drosophila melanogaster?

Tony Irwin wrote:

Unlike the melanogaster group (melanogaster and simulans) which have a single row of teeth along the ventral and apical margin of the oviscapt, suzukii has an additional short row dorsally (shown nicely in http://www.scielo.br/img/revistas/rbent … html#fig11. However this more dorsal row is present in several of the obscura group too. So I'm not quite sure what is meant by this bit of the couplet. Without wishing to align myself with GWB, I do like books with pictures!

Thanks ever so much again, Tony. I had another go at the oviscapt and can see at least a couple of strong teeth on the upper margin as shown in the attached images. So, looks like D. suzukii goes in the records. This episode prompted me to check a batch collected from another site this winter (Newton St Cyres, Devon) and it looks like I have some more there including males.

Regards,
Andrew.


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