Diptera.info - Discussion Forum: Can this really be Ceromya dorsigera??

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Can this really be Ceromya dorsigera??
ChrisR	#1 Posted on 10-10-2009 14:47
Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04	This is probably the most exciting fly found so far in the Galicia sample. Collected in north-west Spain 19.x.2007. It keys easily to Ceromya then in Andersen's Ceromya key it goes: - vein R1 completely setulose dorsally and apically on the ventral surface - body colour very yellow with darker mesonotum - abodmen shining, undusted - antenna-3 very rounded - suboval C.dorsigera is described as 'an extremely rare Eurasian species known only from a very few specimens'. Tantalizingly, one of the recorded specimens comes from 'northern Spain'. ChrisR attached the following image: [41.38Kb] Edited by ChrisR on 10-10-2009 14:50 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.


ChrisR	#2 Posted on 10-10-2009 14:47
Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04	another angle... ChrisR attached the following image: [54.02Kb] Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.


ChrisR	#3 Posted on 10-10-2009 14:48
Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04	another angle... ChrisR attached the following image: [50.55Kb] Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.


Zeegers	#4 Posted on 18-10-2009 20:18
Member Location: Soest, NL Posts: 19282 Joined: 21.07.04	Could be, if you are sure about the genus (no Ceranthia ?) Theo


ChrisR	#5 Posted on 18-10-2009 20:28
Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04	I ruled out Ceranthia because the lower katepisternal bristle is much smaller than the upper anterior one and the anal vein doesn't reach the wing margin Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.


Kahis	#6 Posted on 18-10-2009 22:50
Member Location: Helsinki, Finland Posts: 1999 Joined: 02.09.04	I doubt the rarity of this species. It was recently found as new for Finland from Malaise traps. 3 out of 20 traps on the �land islands yielded this species (a total of 6 females). I suspect it (and the other predominantly yellow Ceromya, C. silacea) are mostly active at dusk or even during the light summer nights here in the north. C. silacea is pretty common in Malaise trap materials here, but still very rarely found by netting even when the trap surrounding have been extensively covered by sweep-netting. Kahis


ChrisR	#7 Posted on 18-10-2009 23:11
Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04	Interesting observation Kahis ... this was sweep-netted but, like you, I am sure that many species would seem much commoner if we all ran more Malaise traps Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.


ChrisR	#8 Posted on 11-06-2010 15:23
Super Administrator Location: Reading, England Posts: 7706 Joined: 12.07.04	As a follow-up - the determination of Ceromya dorsigera has been confirmed by Peter Tschorsnig Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.