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Diptera.info :: Identification queries :: Diptera (adults)
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Gymnomus spectabilis female (Heleomyzidae)?
Stephan Mende
#1 Print Post
Posted on 30-12-2024 13:34
Member

Location: Hildesheim, Germany
Posts: 93
Joined: 25.08.24

Hello,

can someone help me with this ~ 7 mm ("estimated", I measured the twig afterwards) Heleomyzinae? I found it basking in the sun in a deciduous forest.
Using Illustrated draft key to the UK genera and species of Heleomyzidae by Sivell, Stubbs and Andrews (November 2024) https://dipterist...cheme/home I got to Gymnomus spectabilis.

I think I got all relevant characteristics from the key. But are there any other similar species in Germany that could be considered?

Northern Germany, Hildesheim, 28.12.2024, 233 m, ~ 7 mm
inaturalist-open-data.s3.amazonaws.com/photos/460404707/original.jpg
- dark spots at bases of dorsocentrals
- strong costal spines

inaturalist-open-data.s3.amazonaws.com/photos/460404755/original.jpg
- katepisternum with 1 strong bristle in upper hind corner
- 1 pair of vibrissae, no bristles above vibrissae
- posterior gena lacking prominent bristle

inaturalist-open-data.s3.amazonaws.com/photos/460404752/original.jpg
- hind femur with 2-3 anterodorsal bristles in apical third
- mid tibia with 2 ventral apical bristles

inaturalist-open-data.s3.amazonaws.com/photos/460404869/original.jpg
- thorax grey, abdomen orange
- anepisternum bare

Thank you in advance,
Stephan
Edited by Stephan Mende on 01-01-2025 16:42
 
www.inaturalist.org/observations?user_id=grid33
Andrzej
#2 Print Post
Posted on 30-12-2024 16:38
Member

Location: Poland
Posts: 2405
Joined: 05.01.06

Here is the original key to the Gymnomus species in the Palearctic Region. https://www.resea...leomyzidae ;

and here is a better one:
https://www.resea...cmVjdCJ9fQ .
If I can remember the VIIIth sternite of G. spectabilis is distinctly elongated and heart-shaped at the apex (unpublished data)...
Edited by Andrzej on 30-12-2024 16:39
dr. A. J. Woznica, Institute of Environmental Biology, Wroclaw University of Environmental & Life Sciences
 
Stephan Mende
#3 Print Post
Posted on 01-01-2025 16:49
Member

Location: Hildesheim, Germany
Posts: 93
Joined: 25.08.24

Thanks for the additional resources. As far as I can tell, it still matches G. spectabilis. In addition to the other key:
- 1 row of genal setulae
- anterior orbital bristle at least 0.60 of the height of the posterior bristle
- thin dark brown stripe present between the dorsocentrals

However, I'm not quite sure if what I was looking at are the genal setulae and anterior/posterior orbital bristles. Is it 1 and 2 or 1 and 3? 3 is way shorter in other photos I checked that should be G. spectabilis, too. (see attached picture).
Stephan Mende attached the following image:


[105.63Kb]
Edited by Stephan Mende on 01-01-2025 16:52
Stephan
 
www.inaturalist.org/observations?user_id=grid33
Andrzej
#4 Print Post
Posted on 02-01-2025 13:24
Member

Location: Poland
Posts: 2405
Joined: 05.01.06

no. 3 = anterior orbital, no. 3 = postrior orbital (genal setulae are OK). Pls check the VIII th abdominal sternite (it is a one small plate on the ventral side), but the ovipositor must be strongly protruded ... That would solve the ID problems...
Edited by Andrzej on 02-01-2025 13:25
dr. A. J. Woznica, Institute of Environmental Biology, Wroclaw University of Environmental & Life Sciences
 
Stephan Mende
#5 Print Post
Posted on 06-01-2025 08:01
Member

Location: Hildesheim, Germany
Posts: 93
Joined: 25.08.24

Thank you, the anterior orbital is much shorter then. Unfortunately I don't have any ventral shots. The closest I could get are these photos. But I can't make anything out of it.
Stephan
 
www.inaturalist.org/observations?user_id=grid33
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