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View Thread :: Identification queries :: Diptera (eggs, larvae, pupae)
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[Triarthria setipennis] From pupa to imago
#1 Print Post
Posted on 09-08-2004 20:24
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Location: Fragnes (Burgundy, France)
Posts: 183
Joined: 15.06.04


Here are some pupas I found under bark form a plane tree :
(St Apollinaire (21), France - March 2004 - pupas 4 mm long)

They were fixed to the nest of some Gnophosidae Arachnid (Haplodrassus sp ?), nearby a dead Forficula sp.

Imagos emerged in April :

- Can anyone help identifying ?

- And what is the relation between these pupas, the Forficula corpse and the arachnid nest ?...

Thanks !
Edited by Arthropa on 10-03-2007 00:29
Benoit MARTHA Smile
Gerard Pennards
#2 Print Post
Posted on 09-08-2004 23:01
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Location: Amersfoort
Posts: 1909
Joined: 07.06.04

Hoi Benoit,

The first thing I can tell you is that the flies belong to the family Tachinidae!
Members of this family are known parasites from all kinds of families of insects, like for example Lepidoptera and Hemiptera.
Maybe it is a parasite on the earwig, but that is hard to tell!
It can be a coincidence that you have found it in this position.
Gerard Pennards
Paul Beuk
#3 Print Post
Posted on 10-08-2004 17:37
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Location: Netherlands
Posts: 18837
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If it is one of the Dermaptera parasitoids, then the pupa at least fit that of Triarthria setipennis. I have no good illustration of the adult, but at least in the old plate by Meigen, the thorax in that species in entirely grey. That could be difference of sexes, lighting, etc. Maybe someone can confirm the adult id?

- - - -

Paul Beuk on
#4 Print Post
Posted on 11-08-2004 09:24
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Location: Fragnes (Burgundy, France)
Posts: 183
Joined: 15.06.04

I'm not sure at all whether these flies were parasitoids of the dermaptera, or whether the dermaptera was just some prey of the arachnid that was in the nest (because there was one in the white nest one can see on the second photo).
The pupas were like "incrustated" in the arachnid nest silk.
For the color of the thorax, I can confirm there are some dark markings (dried specimen still available).
Benoit MARTHA Smile
#5 Print Post
Posted on 07-09-2004 18:14

Location: Soest, NL
Posts: 16659
Joined: 21.07.04

Paul is right:

It is Triarthria setipennis, a parasitoid of Dermaptera.
This species is quite common and can be reared rather easily,
as well demonstrated !

Theo Zeegers
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23.09.21 15:29
All sorted.

16.09.21 22:24
Sorry put 5 new threads in Asilidae forum instead in Syrphidae forum, can pleas an admin move it to Syrph? THANKS, Norbert

09.09.21 07:48

09.09.21 07:47
wing ventation is totally different

03.09.21 12:51
Hi, what's the major difference between dolichopodidae and rhagionidae? Can someone help me? Thanks!

28.06.21 15:24
thx TO eklans

03.06.21 11:11
@Tony Irwin Thank you Tony! I've emailed you there Pfft

02.06.21 22:26
Rob - can you PM me with an e-mail address, and I'll send it over.

02.06.21 13:16
Hello chaps! Does anyone have a copy of: Revision of the willow catkin flies, genus Egle Robineau-Desvoidy (Diptera: Anthomyiidae), in Europe and neighbouring areas ?? I'd be ever so grateful! Rob

31.05.21 14:31
The part that got deleted is "longer, dark median stripe on thorax"

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