Diptera.info :: Identification queries :: Diptera (adults)
 Tachinidae - Exorista larvarum?
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| tim worfolk |
Posted on 22-07-2009 18:11
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 Member Location: Devon, England Posts: 737 Joined: 05.05.09 |
Just a wild guess or this keyed out nicely - still might be wrong though? Fortunately I got a lot of photos - in spite of the wind. An expert opinion? 22/7/2009; Devon, England; wet pasture. Thanks Tim. tim worfolk attached the following image:  [136.28Kb] |
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| tim worfolk |
Posted on 22-07-2009 18:12
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Member Location: Devon, England Posts: 737 Joined: 05.05.09 |
2nd photo
tim worfolk attached the following image:  [103.77Kb] |
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| tim worfolk |
Posted on 22-07-2009 18:13
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Member Location: Devon, England Posts: 737 Joined: 05.05.09 |
3rd photo
tim worfolk attached the following image:  [104.77Kb] |
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| tim worfolk |
Posted on 22-07-2009 18:14
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Member Location: Devon, England Posts: 737 Joined: 05.05.09 |
and finally....
tim worfolk attached the following image:  [104.96Kb] |
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| Jaakko |
Posted on 22-07-2009 20:29
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 Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
Hi, Good photos! I can see four dc bristles, bare eyes.. so likely larvarum based on the habitat (fasciata commoner on moorland etc). Jaakko |
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| Zeegers |
Posted on 22-07-2009 20:30
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Member Location: Soest, NL Posts: 19143 Joined: 21.07.04 |
Not a wild guess, an excellent ID ! You see, Tachinids are not that complicated (sometimes) Theo |
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| tim worfolk |
Posted on 22-07-2009 20:43
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Member Location: Devon, England Posts: 737 Joined: 05.05.09 |
Thanks guys - really pleased I got this one right. Theo, I like complicated, it's just that so many characters seem to be barely determinable from photos - I know, I should take specimens, but I like a challenge! Tim |
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| Jaakko |
Posted on 22-07-2009 20:48
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Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
Just as a forewarning: Most of the Finnish specimens of fasciata key out as larvarum with the T&H Central European keys, one should always need to check the male genitalia for 100% id! These species, however, have a clear habitat difference. Jaakko |
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| tim worfolk |
Posted on 22-07-2009 21:08
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Member Location: Devon, England Posts: 737 Joined: 05.05.09 |
Jaako, when I said I like complicated, I wasn't really thinking of going that far...but thank you, consider me forewarned. Now, the habitat, I would call it sort of pasture, sort of moorland - a lot of rough grass, tussocky, peaty in places, but still definitely farmland. Alt. only about 150m but in this part of England - on the Atlantic fringe - qualifies as upland almost. Does this make sense re fasciata or larvarum? Tim |
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| ChrisR |
Posted on 22-07-2009 21:27
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 Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04 |
Another vote for larvarum here - for no other reason than the larvarum I have found always have very yellow facial dusting, while fasciata is whiter/silvery. 
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Zeegers |
Posted on 24-07-2009 16:26
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Member Location: Soest, NL Posts: 19143 Joined: 21.07.04 |
The Finnish experience is interesting, but not met here in the West. I have seen large series reared, of which we knew it had to be fasciata. I had no difficulty separating them with T&H. Maybe the ventral hairs are tricky, but the facial bristles were always obvious: no gap between descending bristles and ascending vibrissae in lateral view --> fasciata. Theo |
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