Diptera.info :: Identification queries :: Diptera (adults)
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 Tachinid Leucostoma
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| jeremyr |
Posted on 26-08-2015 23:39
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 Member Location: Tottenham Posts: 577 Joined: 18.05.12 |
I found this tachinid on yarrow in july in north london. The dusted tergites suggests L. anthracinum which is apparently common in south europe so it's most likely, but how can I be sure it isn't one of the other 3 possible species in the key? eg crassum, tetraptera or turonicum? It seems to have 2-3 rows of hairs on the parafacial. Can the frons width be used to determine the species? I cannot see a difference between the dusting on the hairy part of the cheek compared to the hairy part. There's also something about the tergites and some diagrams which I can't quite figure out unless they are dorsal views. Are close-ups of the genitalia likely to help - they're hooked out and ready - or is it just that view of the last tergites that's important? Jeremy jeremyr attached the following image:  [155.86Kb] |
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| Zeegers |
Posted on 27-08-2015 08:05
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Member Location: Soest, NL Posts: 18787 Joined: 21.07.04 |
Hi Jeremy Yes, this is Leucostoma and yes, males are very difficult to identify. Do you have more species ?? If so, we'd really need a good look at the latter tergites in ' dorsal' view. Do you have the key to Central Europe (Tschorsnig & Herting) ? The difference in dusting on the head can only be found by playing with the light and shifting angles: impossible to see in a still. Theo |
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| jeremyr |
Posted on 28-08-2015 03:04
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Member Location: Tottenham Posts: 577 Joined: 18.05.12 |
thanks Theo, yes it's the key to Central Europe (Tschorsnig & Herting) that I refer to in my question, couplets 5-7 for this genus, and figures 193, 194, 188 etc. I'll try and get a close-up dorsal view of the terminalia then and hopefully match it to one of the illustrations. At the same time I'll try tilting the head and light-source to see what dusting becomes evident Jeremy |
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| Zeegers |
Posted on 28-08-2015 09:00
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Member Location: Soest, NL Posts: 18787 Joined: 21.07.04 |
Hi Jeremy, I did not check, but is it not the case that only one species is known for the UK ? (L. anthracinum.) Theo |
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| Zeegers |
Posted on 28-08-2015 12:24
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Member Location: Soest, NL Posts: 18787 Joined: 21.07.04 |
Sorry, I meant simplex, my mistake. Theo |
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