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Tachinidae small
thijsdegraaf	#1 Posted on 20-10-2009 22:04
Member Location: Bergen (NH) Posts: 838 Joined: 21.10.08	Photographed in the Netherlands 20-10-09. Bergen (N.H.) Tachinidae. Small, about 5, 6mm. Again I don't know the species . They are so difficult. Best regards, Thijs thijsdegraaf attached the following image: [91.63Kb] Edited by thijsdegraaf on 20-10-2009 22:12 http://www.tuin-t...engels.htm


thijsdegraaf	#2 Posted on 20-10-2009 22:04
Member Location: Bergen (NH) Posts: 838 Joined: 21.10.08	second photo thijsdegraaf attached the following image: [105.95Kb] http://www.tuin-t...engels.htm


thijsdegraaf	#3 Posted on 20-10-2009 22:06
Member Location: Bergen (NH) Posts: 838 Joined: 21.10.08	third photo thijsdegraaf attached the following image: [127.64Kb] http://www.tuin-t...engels.htm


thijsdegraaf	#4 Posted on 20-10-2009 22:07
Member Location: Bergen (NH) Posts: 838 Joined: 21.10.08	last photo thijsdegraaf attached the following image: [128.83Kb] http://www.tuin-t...engels.htm


Jaakko	#5 Posted on 21-10-2009 14:37
Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08	Hmm.. Exoristini. Could be even one of the smaller Exorista, such as tubulosa or then something like Bessa selecta? Facial ridges look bare, though.


thijsdegraaf	#6 Posted on 22-10-2009 15:59
Member Location: Bergen (NH) Posts: 838 Joined: 21.10.08	Thanks Jaakko, I see no suggestions of other Tachinidae experts. So I think they agree with you. A difficult fly again. Best regards, Thijs http://www.tuin-t...engels.htm


ChrisR	#7 Posted on 22-10-2009 18:45
Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04	Something of a mystery to me - I don't know anything quite that small but Jaakko's suggestion of Bessa sounds probable - not sure if it is possible to prove it though Edited by ChrisR on 22-10-2009 20:51 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.


Zeegers	#8 Posted on 22-10-2009 19:58
Member Location: Soest, NL Posts: 19133 Joined: 21.07.04	I missed this, but indepedent of Jaakko I reached the same conclusion: Bessa selecta. And then I saw his message Theo


ChrisR	#9 Posted on 22-10-2009 20:52
Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04	Is the identification based on the fact that there really isn't much else in the Exoristini that is so small? The antennae look quite distinctive. Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.


thijsdegraaf	#10 Posted on 22-10-2009 20:52
Member Location: Bergen (NH) Posts: 838 Joined: 21.10.08	Thanks Theo, Chris and Jaakko. Three experts with the same name Best regards, Thijs http://www.tuin-t...engels.htm


thijsdegraaf	#11 Posted on 22-10-2009 21:25
Member Location: Bergen (NH) Posts: 838 Joined: 21.10.08	I hadn't seen your question Chris. Both: 21:52 Thijs http://www.tuin-t...engels.htm


ChrisR	#12 Posted on 22-10-2009 21:43
Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04	That's OK ... I hardly ever see Bessa but they are tiny and they look like this so Jaakko's suggestion seemed a good one. But I was just interested to see if Theo or Jaakko used some other features in their IDs We are all learning Edited by ChrisR on 22-10-2009 21:43 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.


Jaakko	#13 Posted on 23-10-2009 07:41
Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08	Hi Chris! Just a combination of features: sharp kink in the m-vein, white hairs behind the head, low "short-legged" sitting position and small size. Here in North, B. selecta is the only common one fitting to this criteria, and you have even less species in the UK, so I was encouraged to suggest that.


ChrisR	#14 Posted on 23-10-2009 08:25
Super Administrator Location: Reading, England Posts: 7703 Joined: 12.07.04	Thanks Jaakko - I have some Russian B.parallela and selecta so I'll have another look at them Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.


thijsdegraaf	#15 Posted on 23-10-2009 10:04
Member Location: Bergen (NH) Posts: 838 Joined: 21.10.08	you have even less species in the UK Thanks for the explanation Jaakko. I know much more now about my fly. For I could not find much on internet. But I live in the Netherlands Thijs http://www.tuin-t...engels.htm


Jaakko	#16 Posted on 23-10-2009 13:29
Member Location: Joensuu, Finland Posts: 479 Joined: 04.08.08	Sorry Thijs! Somehow got mixed up with the various authors on this thread...

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