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Diptera.info :: Identification queries :: Diptera (adults)
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Ectophasia oblonga?
johnes81
#1 Print Post
Posted on 12-08-2017 14:51
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Location: Berlin, Germany
Posts: 578
Joined: 15.10.16

I wish to re-evaluate my understanding of Ectophasia.
I have identified an Ectophasia as oblonga based upon keys of Tschorsnig.

According to Tschorsnig, the longitudinal stripe should be a maximum of 1/8 of the abdomen width.
The abdomen should be longer than wide.

I am confused about the color. I think that the species in my photo is orange not yellow.
But if you compare it to the color red, then it is more yellow. Does color really matter?

I would like confirmation that the species in my photo is indeed oblonga.
Otherwise, I will assume that I am misunderstanding Tschorsnig's keys or his keys are not accurate.
johnes81 attached the following image:


[231.73Kb]
John and Nini
 
Piluca_Alvarez
#2 Print Post
Posted on 12-08-2017 15:03
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Location: Madrid, Spain
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This is one of those cases that confuse me a lot and I have found several times. A female-looking male? Look the wing-markings, they are of a female. However the abdomen is not of a typical female. I believe male-looking females do exist. What I really need is a lesson about this problem. I have never found anything about it in my literature Sad
Edited by Piluca_Alvarez on 12-08-2017 15:03
 
johnes81
#3 Print Post
Posted on 12-08-2017 15:07
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yes, this is a male in my opinion. I've labelled it a male. I had trouble at first but I agree that overall it is a male. Very strange one to me too.

I spent an entire night reading Tschorsnigs keys to id this one. I conclude that it must be oblonga. Now I wonder if I am correct?
John and Nini
 
Piluca_Alvarez
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Posted on 12-08-2017 15:10
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Location: Madrid, Spain
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Simply wait for Theo Wink I am very looking forward to what he has to say about these problem. It has been bothering me for quite a long time.
 
johnes81
#5 Print Post
Posted on 12-08-2017 15:16
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I agree. We wait for Theo. I lack the experience here.
I figured this to be oblonga because of the haustellum, 1/8 longitudinal stripe, abdomen is oblong. I could be wrong. I'd love to know more about this problem. I am confused now Smile

I will wait for Theo and sip some coffee. I will look through more photos ...
John and Nini
 
Zeegers
#6 Print Post
Posted on 12-08-2017 16:03
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Location: Soest, NL
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For starters, this is a female or a feminine male ... so all male features are out.
I can tell the difference only by genitalia....

Theo
 
johnes81
#7 Print Post
Posted on 12-08-2017 16:27
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feminine male is interesting. Hopefully photos of genitalia have been published.

I should be able to collect Ectophasia throughout August. Maybe next year I will come across another feminine male or odd female. I will definitely collect it, then dissect it.

Thank You.
John and Nini
 
johnes81
#8 Print Post
Posted on 12-08-2017 16:31
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For me, I think that genitalia is the only road to follow. Too many problems exist without genitalia. I will just assume that I need genitalia for everything. I suppose that I will learn more this way. Plus, it will give me a chance to photograph genitalia of both males and females for everything. I'm going to stop trying to id using keys. Too many problems.
John and Nini
 
Zeegers
#9 Print Post
Posted on 12-08-2017 19:14
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Location: Soest, NL
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You made a simple mistake using the key, you learn from it. Don't give up so easily ! 92 % of the Tachinidae can benidentified without genitalia.
However, it cannot be learned in one week. I started 32 years ago....


Theo
 
johnes81
#10 Print Post
Posted on 12-08-2017 20:01
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Location: Berlin, Germany
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Thank You, Theo. I am just angry with myself for making errors. I try hard to get it correct. In this case, I pushed myself too much for that one more photo. The species flew and I was unable to collect it. I hate it when I need a specimen and don't have one. I will move on. Next time I will examine the species through the lens to determine if I need to collect it. Otherwise, I'll key it out.

32 years? You are the Supreme Being Dipterist. I am lucky that you give me the time of day. Thank You very much for not treating me like an idiot. You are Wonderful!
John and Nini
 
Christine Devillers
#11 Print Post
Posted on 13-08-2017 10:01
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Location: Spa, Belgium
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Are there features that could help to see the difference between female and male gynaecomorph of Ectophasia ?

Can females of Ectophasia have large claws like those of male ?
Are there no difference in the shape of the tip of abdomen ?

Christine
 
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20.10.17 14:37
It was an inode issues. In practise, I think it means there were more files on the server than the system catered for. The limit has been doubled and we should be save for quite some time.

20.10.17 10:41
I'm relieved you managed to fix the site, Paul! You had us a bit worried there Wink

19.10.17 23:38
still a failure

19.10.17 17:03
Or a write right in the temp folder.

19.10.17 16:18
Error 122 is probably a full disk or over quote.

19.10.17 15:36
Gallery is Off Shock

18.10.17 14:40
Thanks very much Paul- you know loads!

18.10.17 09:07
Zoologicheskii Zhurnal: http://pleiades.o.
..al/zooeng/

16.10.17 14:24
Hello Can any1 give me a link to this journal pls? zool. J. Moscow Thx

10.10.17 14:39
Thanks again Paul, looks like a ditto

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