Diptera.info - Discussion Forum: Which Gymnosoma sp. ?

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Which Gymnosoma sp. ?
skero74	#1 Posted on 16-10-2009 09:43
Member Location: Linarolo (PV) Italy Posts: 80 Joined: 25.09.09	Bibbona Livorno (Italy). Date: 04/06/2008 Hello, can i determine the species of this Gymnosoma or is it not possible from the picture? Thanks Roberto skero74 attached the following image: [115.96Kb] Edited by skero74 on 16-10-2009 09:45


ChrisR	#2 Posted on 16-10-2009 10:36
Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04	I'd say it is impossible, considering your southern location and the single angle. If you have more angles and more close-ups of the fly then it might help Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.


skero74	#3 Posted on 16-10-2009 12:34
Member Location: Linarolo (PV) Italy Posts: 80 Joined: 25.09.09	I have only this close up skero74 attached the following image: [138.87Kb]


Gordon	#4 Posted on 16-10-2009 13:55
Member Location: Lake Kerkini, Greece Posts: 1097 Joined: 02.01.08	They all look like rotunda to me, but then that's the only one of the 13 I've seen. (meaning I'm at least 92.308% ignorant here. Edited by Gordon on 16-10-2009 20:54


ChrisR	#5 Posted on 16-10-2009 14:15
Administrator Location: Reading, England Posts: 7699 Joined: 12.07.04	Gordon wrote: They all look like rotunda (sic - rotundatum) to me Join the club! But that is really the problem ... the features used to identify them are either variable (dusting) or not conclusive (genitalia are identical in many species). You are left wondering if the dusting pattern is enough or whether hairs on the mesoscutum are erect or prone, long or short ... and to me they always look the same! Of course, with a specimen they are often possible to identify ... but it is never 'easy' Edited by ChrisR on 16-10-2009 14:17 Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.