Diptera.info :: Identification queries :: Diptera (adults)
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 Besseria sp.?
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| Rui Andrade |
Posted on 14-07-2009 18:20
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 Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
I saw many of these tachinids in dunes in Viana do Castelo, North of Portugal. It reminds me of Besseria, could that be correct? date: 07/07/2009  |
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| jorgemotalmeida |
Posted on 14-07-2009 18:21
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 Member Location: Viseu - PORTUGAL Posts: 9296 Joined: 05.06.06 |
i think so imho. |
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| Zeegers |
Posted on 15-07-2009 18:54
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Member Location: Soest, NL Posts: 18516 Joined: 21.07.04 |
Definitely an excellent picture of a Besseria. Difficult genus, might be either dimidiata or reflexa Theo |
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| Rui Andrade |
Posted on 15-07-2009 19:30
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Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
Thanks Jorge and Theo. Theo, what would you need in order to decide between one of them? |
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| Zeegers |
Posted on 15-07-2009 20:59
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Member Location: Soest, NL Posts: 18516 Joined: 21.07.04 |
That will be very difficult. I'll check and come back to you. Theo |
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| ChrisR |
Posted on 16-07-2009 08:52
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 Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04 |
Just a quick quote from T&H: 4. Peristome dusted white. Frontal stripe with a yellow ground colour. Middle tibia with 2 inner bristles, the upper often much weaker. Males: tergite 5 with short upright hairs; cerci-surstyli complex 2 - 3x as long as the epandrium, roof-like developed, inside with a ring of yellow scale hairs. Females: tergites 2 and 3 ventrally with a spine field.................dimidiata Zett. - Peristome at least in its front half shiny black. Frontal stripe in the ground colour black. Middle tibia with 1 inner bristle. Males: tergite 5 dorsally hairless, smooth and shiny; cerci and surstyli a little shorter than the epandrium, without yellow scale hairs. Females: spine field only present on tergite 2..............reflexa R.D. So a closer view of the legs or head at different angles would be useful 
Edited by ChrisR on 16-07-2009 08:53 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London. |
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| Rui Andrade |
Posted on 17-07-2009 14:54
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Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
Thanks Chris. I have some specimens with me, later I'll have a look at them. |
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| Zeegers |
Posted on 17-07-2009 19:45
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Member Location: Soest, NL Posts: 18516 Joined: 21.07.04 |
This was what I had to look up, thanks This clearly suggests reflexa. Still, a lateral headshot would be useful Theo |
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| Rui Andrade |
Posted on 20-07-2009 18:37
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Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
Ok, finally some photos. They show two different specimens. Specimen 1:    Here is a photo of the middle left tibia viwed from behind:  Specimen 2:    Middle left tibia viewed in this case from the front:  |
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| Zeegers |
Posted on 21-07-2009 20:10
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Member Location: Soest, NL Posts: 18516 Joined: 21.07.04 |
so, definitely dimidiata and not reflexa. The black on the gena is missing, moreover, the erect hairs on tergite 5 of the male (first specimen) is excellently illustrated ! Theo |
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| Rui Andrade |
Posted on 21-07-2009 20:49
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Member Location: Portugal Posts: 3122 Joined: 19.06.07 |
Thank you for your help Theo! I think it's a new species for Portugal. The only two species known so far are B. lateritia and B. zonaria. |
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| Zeegers |
Posted on 22-07-2009 16:56
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Member Location: Soest, NL Posts: 18516 Joined: 21.07.04 |
Portugal has been poorly studied (uptill now, of course, guys !) and it is known from Spain. I can't say I'm surprised. Theo |
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but don't see the image in the post.