Diptera.info :: Identification queries :: Diptera (adults)
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 Is it Tabanus species from Sicily?
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| Chalybion |
Posted on 20-07-2025 10:38
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Member Location: Italy, Ravenna province Posts: 13 Joined: 10.07.25 |
Hi, this is my first thread as my interest in Diptera is occasional. Because the lack of median callus (seems to me), this specimen is not easy to me to identify by my keys; palpi and general aspect are similar to T. cordiger, but I need opinions about it. Eyes unbanded in living specimen. Collected by me in a clearing in woodland with bovids. Locus: Sicily, Ragusa province, near Monterosso Almo, 425 m asl, on VI.03.2025. Thank's in advance for any opinion. Giorgio Pezzi. Chalybion attached the following image:  [51Kb] Edited by Chalybion on 20-07-2025 10:43 |
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| Chalybion |
Posted on 20-07-2025 10:41
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Member Location: Italy, Ravenna province Posts: 13 Joined: 10.07.25 |
Chalybion wrote:
Hi, this is my first thread as my interest in Diptera is occasional. Because the lack of median callus (seems to me), this specimen is not easy to me to identify by my keys; palpi and general aspect are similar to T. cordiger, but I need opinions about it. Collected by me in a clearing in woodland with bovids. Locus: Sicily, Ragusa province, near Monterosso Almo, 425 m asl, on VI.03.2025. Thank's in advance for any opinion. Giorgio Pezzi. Chalybion attached the following image:  [101.6Kb] |
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| Chalybion |
Posted on 20-07-2025 10:41
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Member Location: Italy, Ravenna province Posts: 13 Joined: 10.07.25 |
Chalybion wrote:
Hi, this is my first thread as my interest in Diptera is occasional. Because the lack of median callus (seems to me), this specimen is not easy to me to identify by my keys; palpi and general aspect are similar to T. cordiger, but I need opinions about it. Collected by me in a clearing in woodland with bovids. Locus: Sicily, Ragusa province, near Monterosso Almo, 425 m asl, on VI.03.2025. Thank's in advance for any opinion. Giorgio Pezzi. Chalybion attached the following image:  [60.04Kb] |
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| Chalybion |
Posted on 20-07-2025 10:42
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Member Location: Italy, Ravenna province Posts: 13 Joined: 10.07.25 |
Chalybion wrote:
Chalybion wrote: Hi, this is my first thread as my interest in Diptera is occasional. Because the lack of median callus (seems to me), this specimen is not easy to me to identify by my keys; palpi and general aspect are similar to T. cordiger, but I need opinions about it. Collected by me in a clearing in woodland with bovids. Locus: Sicily, Ragusa province, near Monterosso Almo, 425 m asl, on VI.03.2025. Thank's in advance for any opinion. Giorgio Pezzi. Chalybion attached the following image:  [56.76Kb] |
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| Zeegers |
Posted on 21-07-2025 14:13
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Member Location: Soest, NL Posts: 19040 Joined: 21.07.04 |
It is definitely cordiger-group, the lacking medium callus is weird. I think I see an eye band and the third antennal segment is red at base, so I am thinking T. leleani, in which the median callus can be quite unclear. Theo |
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| Chalybion |
Posted on 25-07-2025 19:03
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Member Location: Italy, Ravenna province Posts: 13 Joined: 10.07.25 |
Zeegers wrote: It is definitely cordiger-group, the lacking medium callus is weird. I think I see an eye band and the third antennal segment is red at base, so I am thinking T. leleani, in which the median callus can be quite unclear. Theo Hi Theo, many thanks; actually I've collected a second specimen of Tabanus, in my opinion different to this one. I will post it in a few days (or tomorrow); it has the same lack of median callus but different color in palpi, notopleural lobes (black) and tergites. If you will compare with the upper one remember you would be right about band on eye: I remember only one specimen clearly with green banded eyes, being the other apparently without bands in live specimens. Unfortunatly after death it is possible I confused banded and unbanded specimen, collected in same squared meters. Please wait for second specimen. Giorgio. Edited by Chalybion on 25-07-2025 19:04 |
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| libor |
Posted on 25-07-2025 20:00
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Member Location: western Bohemia Posts: 1290 Joined: 30.05.09 |
Giorgio, put several wetted pieces of toilet paper into a small plastic box, put your dried horsefly inside and store it in a fridge. After one or two deys, you can observe the refreshed eyes. If the eyes were banded, you can see such band(s) after the refreshing. |
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| Zeegers |
Posted on 26-07-2025 09:19
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Member Location: Soest, NL Posts: 19040 Joined: 21.07.04 |
Well, you might have unifasciatus and/or cordiger as well. Check the eye band as Libor described and check the width of frons and colournof antenna and notopleural lobes Theo |
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| Chalybion |
Posted on 30-07-2025 20:01
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Member Location: Italy, Ravenna province Posts: 13 Joined: 10.07.25 |
libor wrote: Giorgio, put several wetted pieces of toilet paper into a small plastic box, put your dried horsefly inside and store it in a fridge. After one or two deys, you can observe the refreshed eyes. If the eyes were banded, you can see such band(s) after the refreshing. Thank to you and Theo for info. I'm doing the refreshing. Unfortunately, don't wait for second specimen: it seemed to me greasy and after diving in acetone (to see if there were white patches on abdomen or not), I lost it because a sudden gust make fly the plastozote were it was fixed to dry near the window.  Until now any trace of it, Sorry! News about the upper one soon as possible. Giorgio. |
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| Chalybion |
Posted on 01-08-2025 22:00
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Member Location: Italy, Ravenna province Posts: 13 Joined: 10.07.25 |
Hi, here is the result of rehydration of the specimen, with a pic after two days in fridge and just a few seconds out of it: it seems to be as the same of second of my pics. I do not see any band when all ommatidia are well focused but confirmation is needed about this. 
Chalybion attached the following image:  [87.03Kb] |
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| Chalybion |
Posted on 02-08-2025 13:42
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Member Location: Italy, Ravenna province Posts: 13 Joined: 10.07.25 |
After new drying the aspect is the following, with clear orangy lateral patch on end of 1st and almost entire 2nd tergites.
Chalybion attached the following image:  [99.38Kb] Edited by Chalybion on 02-08-2025 13:43 |
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| Zeegers |
Posted on 02-08-2025 14:26
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Member Location: Soest, NL Posts: 19040 Joined: 21.07.04 |
I missed it gefire, but second and third pic "clearly" show an eyeband. So leleani it is. Theo |
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