Diptera.info :: Identification queries :: Diptera (adults)
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 Isoneuromyia? No Orfelia fasciata!
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| Widus |
Posted on 19-10-2020 20:21
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Member Location: Posts: 70 Joined: 12.06.10 |
Hi, Collected dry in my house (Lausanne, Switzerland). I get to Isoneuromya pseudochracea but according to Michal MANTIČ & Jan ŠEVČÍK, costa should go beyond the tip of R5 and stem of M should be longer than frm which is apparently not the case here. Where is my mistake? Widus attached the following image:  [252.47Kb] Edited by Widus on 22-10-2020 18:31 |
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| Widus |
Posted on 19-10-2020 20:25
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Member Location: Posts: 70 Joined: 12.06.10 |
Please tell me if there is a mistake with the labeling of the veins
Widus attached the following image:  [259.47Kb] Edited by Widus on 19-10-2020 20:25 |
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| Widus |
Posted on 19-10-2020 20:28
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Member Location: Posts: 70 Joined: 12.06.10 |
A side view of the face and upper thorax
Widus attached the following image:  [273.52Kb] |
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| Widus |
Posted on 19-10-2020 20:30
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Member Location: Posts: 70 Joined: 12.06.10 |
Detail of upper wing
Widus attached the following image:  [265.48Kb] |
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| Widus |
Posted on 19-10-2020 20:32
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Member Location: Posts: 70 Joined: 12.06.10 |
Detail of rear thorax
Widus attached the following image:  [194.92Kb] |
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| John Carr |
Posted on 19-10-2020 22:11
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 Member Location: Massachusetts, USA Posts: 10227 Joined: 22.10.10 |
Do the setae continue past the forks of M and Cu? The key by Søli et al. asks about setae on the branches of these veins, not the stems. |
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| Widus |
Posted on 20-10-2020 08:34
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Member Location: Posts: 70 Joined: 12.06.10 |
Thank you John for clarifying this point in the key. No indeed, the setae do not continue past the M and Cu forks (see image below). This now leads me to Orfelia (the tibiae show these 6 rows of black aligned setae; see images 1 and 5 above). Is there a key available for this genus?
Widus attached the following image:  [66.94Kb] Edited by Widus on 20-10-2020 08:47 |
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| Paul Beuk |
Posted on 21-10-2020 10:03
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 Super Administrator Location: Netherlands Posts: 19382 Joined: 11.05.04 |
Posterior margin of prothoracic spiracle apparently without a row of erect black hairs, so certainly no Isoneuromyia.
Paul - - - - Paul Beuk on https://diptera.info |
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| Widus |
Posted on 21-10-2020 12:12
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Member Location: Posts: 70 Joined: 12.06.10 |
Thanks Paul. This points again to Orfelia, doesn't it? These are the Orfelia species listed in Fauna Europaea (in green those listed for Switzerland): Orfelia bezzii (Strobl, 1910) Orfelia bicolor (Macquart, 1826) Orfelia discoloria (Meigen, 1818) Orfelia excelsa Chandler, 1994 Orfelia falcata Zaitzev, 1994 Orfelia fasciata (Meigen, 1804) Orfelia gruevi Bechev, 2002 Orfelia minima (Giglio-Tos, 1890) Orfelia nemoralis (Meigen, 1818) Orfelia nigricornis (Fabricius, 1805) Orfelia pallida (Stæger, 1840) Orfelia persimilis Caspers, 1991 Orfelia tristis (Lundstrom, 1911) Orfelia unicolor (Stæger, 1840) nemoralis, nigricornis, and tristis are largely black on the head, thorax, and abdomen and can therefore be discarded, as can discoloria that does not have a preapical band on the wing (or at most a pale one). I am preparing the genitalia and will post the image soon. |
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| Paul Beuk |
Posted on 21-10-2020 16:50
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Super Administrator Location: Netherlands Posts: 19382 Joined: 11.05.04 |
In our area it probably would be fasciata but I have no (visual/key) reference for all species.
Paul - - - - Paul Beuk on https://diptera.info |
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| Widus |
Posted on 21-10-2020 21:14
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Member Location: Posts: 70 Joined: 12.06.10 |
The genitalia would confirm your hypothesis  Indeed, the genitalia of fasciata present in the gonostyli (=dististyle), a sinuous upper style and a narrow bare lower style, and a tooth-like process on the inner side of the gonocoxite (=basistylus). The genitalia of unicolor and discoloria are clearly different. I have not found (yet) illustrations of bicolor, excelsa, and persimilis but I would be surprised if they have genitalia identical to fasciata. Edit: it is definitely Orfelia fasciata; see my post below. Widus attached the following image:  [260.05Kb] Edited by Widus on 22-10-2020 18:29 |
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| Widus |
Posted on 21-10-2020 21:34
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Member Location: Posts: 70 Joined: 12.06.10 |
It is not Orfelia excelsa: check figure 41 from this publication. It is not Orfelia persimilis: check figure 2 from this publication. It is not Orfelia bicolor based on this public image from Br. J. Ent. Nat. Hist. 13:2001 Figs 6-8. Male genitalia of Orfelia bicolor (Macquart). 6, ventral view of gonocoxites, gonostyli and aedeagus; 7, cerci; 8, tergite 9. Scale line 0.2 mm. Widus attached the following image:  [229.97Kb] Edited by Widus on 22-10-2020 18:28 |
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