Diptera.info :: Identification queries :: Diptera (adults)
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 Tachinidae - Ethilla aemula
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| Zeegers |
Posted on 15-01-2010 20:21
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Member Location: Soest, NL Posts: 19233 Joined: 21.07.04 |
No no, it is already exellently illustrated in the last-but-one picture. Carcelia and some Winthemia have more or less the same. The calyptra is like it is blown from below by a jet, convex and then sharply dropping near the edge. The white part is convex, the dark part (shady) is the drop. Theo |
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| Jaakko |
Posted on 15-01-2010 21:02
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 Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08 |
This feature is one of those things that comes obvious when one sees it... The calypter edge is like in a frisbee. Chris: You don't have any of the Paratryphera over there? P. barbatula is rather common around here, I could have included some in your parcel if I knew! |
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| ChrisR |
Posted on 15-01-2010 22:53
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 Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04 |
Zeegers wrote: The calyptra is like it is blown from below by a jet, convex and then sharply dropping near the edge. OK so to combine Stephen & your descriptions a better wording might be that the upper surface is balloon-like convex with sharply drooping edges ... I think I understand now ... It doesn't help that the species that follow that side of the couplet are all quite unusual 
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| ChrisR |
Posted on 15-01-2010 22:58
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Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04 |
Jaakko wrote: This feature is one of those things that comes obvious when one sees it... The calypter edge is like in a frisbee. Chris: You don't have any of the Paratryphera over there? No Paratryphera here (sadly) - they have never been recorded in the UK  Never mind though - save me one for another time  I think now I understand what the couplet is trying to describe. It just wasn't all that well translated into English I think - I will improve it and I might even throw in your frisbee analogy
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| viktor j nilsson |
Posted on 15-01-2010 23:21
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Member Location: Gothenburg, Sweden Posts: 203 Joined: 25.02.08 |
Zeegers wrote: No no, it is already exellently illustrated in the last-but-one picture. Carcelia and some Winthemia have more or less the same. The calyptra is like it is blown from below by a jet, convex and then sharply dropping near the edge. The white part is convex, the dark part (shady) is the drop. Theo But isn´t the dark part of the calypter rather the dark area on the abdomen showing through? I do think I understand what you mean though, but it is a little bit confusing picture nonetheless. |
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| Stephen R |
Posted on 16-01-2010 12:03
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 Member Location: Clitheroe Lancashire UK Posts: 2396 Joined: 12.06.09 |
As a violin maker I know the difficulty of assessing a 3D surface from a still photo. I think Viktor has a point about the dark area in the penultimate picture, but to my eye the third image in the series has the most information because the highlights are well exposed. There are two shadows from the wing, but discounting them my impression is of the shape Theo describes, not like a frisbee but with an abrupt transition between the inflated area and a thickly reinforced rim. |
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| Zeegers |
Posted on 16-01-2010 12:17
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Member Location: Soest, NL Posts: 19233 Joined: 21.07.04 |
The main point is that in most Goniini / Eryciini the strong downward part at the other edge is lacking, but it is present here. Since in most Goniini / Eryciini this is lacking, the abrupt transition fold is also lacking. Theo |
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| jorgemotalmeida |
Posted on 16-01-2010 21:42
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 Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
Thanks very much to all intervenients for your inputs. Indeed I checked the specimen and fits perfectly all Theo told. Thanks specially to Jaakko for the great ID. Edited by jorgemotalmeida on 16-01-2010 21:43 |
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