Thread subject: Diptera.info :: Tachinidae, outer dune edge, Netherlands -> Meigenia mutabilis
Posted by Paul Hoekstra on 18-08-2021 20:57
#1
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
Posted by Zeegers on 19-08-2021 08:12
#2
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
Posted by Zeegers on 19-08-2021 08:12
#3
Like Brachycoma
Theo
Posted by Paul Hoekstra on 25-08-2021 19:26
#4
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:
Posted by Zeegers on 25-08-2021 20:38
#5
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
Posted by Paul Hoekstra on 31-08-2021 20:33
#6
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.
Posted by Zeegers on 01-09-2021 07:52
#7
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
Posted by Paul Hoekstra on 02-09-2021 20:41
#8
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.
Posted by Zeegers on 03-09-2021 07:48
#9
Very positively M. mutabilis.
So, that one is done !
Theo