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 Gymnomus spectabilis female (Heleomyzidae)?
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| Stephan Mende |
Posted on 30-12-2024 13:34
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Member Location: Hildesheim, Germany Posts: 91 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  - dark spots at bases of dorsocentrals - strong costal spines  - katepisternum with 1 strong bristle in upper hind corner - 1 pair of vibrissae, no bristles above vibrissae - posterior gena lacking prominent bristle  - hind femur with 2-3 anterodorsal bristles in apical third - mid tibia with 2 ventral apical bristles  - thorax grey, abdomen orange - anepisternum bare Thank you in advance, Stephan Edited by Stephan Mende on 01-01-2025 16:42 |
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| Andrzej |
Posted on 30-12-2024 16:38
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Member Location: Poland Posts: 2401 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 If I can remember the VIIIth sternite of G. spectabilis is distinctly elongated and heart-shaped at the apex (unpublished data)...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 |
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| Stephan Mende |
Posted on 01-01-2025 16:49
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Member Location: Hildesheim, Germany Posts: 91 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 |
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| Andrzej |
Posted on 02-01-2025 13:24
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Member Location: Poland Posts: 2401 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 |
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| Stephan Mende |
Posted on 06-01-2025 08:01
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Member Location: Hildesheim, Germany Posts: 91 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 |
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