Thread subject: Diptera.info :: Calliphoridae: ♀ Onesia cf. floralis

Posted by eklans on 14-10-2021 12:57
#1

Hi, I've found this fly on my housewall (Ansbach, DE-Franconia, close to Frankenhoehe Nature Park, old deciduous forest) on 2021-10-12.
I think it is Onesia floralis (sepulcralis): R5 open and 0, 3 ia.
Thank you for your comments!

Edited by eklans on 18-10-2021 08:58

Posted by Zeegers on 15-10-2021 11:38
#2

Yes, looks like Onesia. I would not dare to separate the two species.

Theo

Posted by eklans on 15-10-2021 11:55
#3

Thank you very much Theo!
But are floralis & sepulcralis different species?
fauna-eu call Musca s. as a synonym of O. floralis.
H. Schumann's "Revision der Gattung Onesia..." names 6 species:
O. sepulcralis, austriaca, canescens... and floralis as a synonym of sepulcralis. I could not find a source with sepulcralis and floralis as separate species. :|

Posted by Zeegers on 15-10-2021 14:37
#4

I meant floralis and austriaca.
Apparently, you also might have kowarzi and zumpti, I wasn’t aware of that. So even more, I wouldn’t dare to make the call.

Theo

Posted by eklans on 15-10-2021 15:32
#5

Sorry for being tenacious, but Schumann also added a key and the female of his sepulcralis is the only on to have no pre ia. Also the wings of the other ones look quite different (if in some cases a small ia is present).

Posted by Zeegers on 16-10-2021 08:46
#6

I don’t have Schumann, if you could share a PDF, please send a pm.
The species called sepulcralis by Schumann is called floralis by most modern authors. I don’t know why, check Rognes, but it is a technical matter.
As for the other species, I have no experience with them, somI hold my ground “ I would not dare to make the call”. But separating females based on the presence or absence of a tiny prae IA seems an unwise thing to do to me, unless you really know what you are doing. As said, I don’t :)

Posted by eklans on 16-10-2021 09:24
#7

Hi Theo, pm sent.
Of course you are right, that the prae IA alone is not enough to determine (and Schumann writes, that in rare cases austriace et al could be without it, too) - but in combination with the wing venation it seems to be practical. The wings are shown in Schumann's key, too.

Posted by Zeegers on 18-10-2021 07:19
#8

So, I checked all my Onesia from one locality in Austria:

* based on male genitalia: all are floralis / sepulchralis
* vertex can be narrow or broader
* prae IA can be absent, hairlike or present.

In other words: Schumann's external features are unreliable already in these 10 specimens. Now I know what I am doing, I would not rely on them.

Theo

Posted by eklans on 18-10-2021 09:03
#9

Hi Theo, thank you very much for your efforts!
What do you think of Schumann's feature wing venation? Is this variable, too?

Edited by eklans on 18-10-2021 09:25

Posted by Zeegers on 18-10-2021 18:46
#10

I don’t think you can separate austriaca from floralis in this way. The other species are extremely rare, I don’t know


Theo

Posted by Zeegers on 18-10-2021 18:49
#11

Of course, Schumann isn’t making things up, the tendencies are there. But 80 % reliability is not reliable at an individual level.

I am sorry, I wished it worked better, since extrracting male genitalia is extremely difficult in Onesia.

Theo

Posted by eklans on 18-10-2021 19:48
#12

No problem, Theo, and thanks again for your explanations. I'll leave it as cf. floralis and hope to find more Onesia (and Bellardias).