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 Tachinidae, outer dune edge, Netherlands -> Meigenia mutabilis
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| Paul Hoekstra |
Posted on 18-08-2021 20:57
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Member Location: Posts: 75 Joined: 03.07.11 |
I get stuck keying this specimen with the keys of Tschornig. Could this be an Oswaldia? Yellow pan trap, outer dune edge, Cadzand-Bad, Netherlands in July. https://waarnemin...221719435/. foto's:    
Edited by Paul Hoekstra on 02-09-2021 20:43 |
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| Zeegers |
Posted on 19-08-2021 08:12
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Member Location: Posts: 18446 Joined: 21.07.04 |
No, no Oswaldia in July. For starters: are you sure it is a Tachinid ? Based on these pictures, it is 60/40 a Sarcophagidae to me. Theo |
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| Zeegers |
Posted on 19-08-2021 08:12
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Member Location: Posts: 18446 Joined: 21.07.04 |
Like Brachycoma Theo |
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| Paul Hoekstra |
Posted on 25-08-2021 19:26
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Member Location: Posts: 75 Joined: 03.07.11 |
Thank you for your reply. I looked again at the specimen, but it clearly has a subscutellum, so I still think it is a Tachinidae. See the 2 extra photos:  |
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| Zeegers |
Posted on 25-08-2021 20:38
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Member Location: Posts: 18446 Joined: 21.07.04 |
I agree. Probablym you will find fields of short, peculiar hairs on the ventral side of tergite 4 (apparently: three !). Which would settle the ID as Male Lydella stabulans. Let me know Theo |
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| Paul Hoekstra |
Posted on 31-08-2021 20:33
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Member Location: Posts: 75 Joined: 03.07.11 |
I don't see the discal bristles on tergite 3 and 4, also with Tschornig I would not key there as I see more than 1 bristle at the base of r4+5 and I am not sure if it has 4 st. Also more early in the key of Tschornig I have problems interpreting if the prealar seta is larger or smaller than the posterior notopleural seta, just posterior to the notopleuron there is one large seta and just in front a small seta, I am not sure if the small one also counts as a prealar, or if only the big seta is the prealar seta. Unfortunately I don't manage to take good pictures of it with my cell phone. Here are some additional pictures of the specimen including a ventral view of the abdomen.     |
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| Zeegers |
Posted on 01-09-2021 07:52
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Member Location: Posts: 18446 Joined: 21.07.04 |
Clearly no Lydella. It is Meigenia, so it seems. M. uncinata is a parasitoid of Chrysomelids on Asparagus, so that makes sense. We would need see the genitalia in lateral view, though, to make the identification. Theo |
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| Paul Hoekstra |
Posted on 02-09-2021 20:41
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Member Location: Posts: 75 Joined: 03.07.11 |
Thank you. Yes, Meigenia it should be! I can key to that species, I went wrong on the propleuron, I thought it was bare, but it indeed has some hairs. With the key to species I end up with Meigenia mutabilis. |
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| Zeegers |
Posted on 03-09-2021 07:48
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Member Location: Posts: 18446 Joined: 21.07.04 |
Very positively M. mutabilis. So, that one is done ! Theo |
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but don't see the image in the post.
