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Opomyza?
Nikita Vikhrev	#1 Posted on 17-11-2005 19:23
Member Location: Posts: 9193 Joined: 24.05.05	Sochi, 13 nov, city park. I am not 100% sure that both images is from same fly. Nikita Vikhrev - Zool Museum of Moscow University


Jan Willem	#2 Posted on 18-11-2005 08:59
Member Location: Posts: 2122 Joined: 24.07.04	Hi Nikita, Both flies are females of Opomyza germinationis (Linnaeus, 1758). Jan willem


Nikita Vikhrev	#3 Posted on 18-11-2005 10:55
Member Location: Posts: 9193 Joined: 24.05.05	Thank you Jan. Am I right that in Geomyza vi present, in Opomyza - vi absent? Nikita Vikhrev - Zool Museum of Moscow University


Jan Willem	#4 Posted on 19-11-2005 22:02
Member Location: Posts: 2122 Joined: 24.07.04	Hi Nikita, I don't know for certain what you mean with the vi bristles. The ones behind the ocelli? If that is what you mean, then the answer is no, that is not the difference. These bristles are absent in both genera (but present in the genus Anomalochaeta. The shape of the wings is best to separate the two genera. In Opomyza the wings have well developed alula which are absent in Geomyza. Furthermore the basal and apical setae on the scutellum are about equal in length in Opomyza whereas in Geomyza the apical setae are much longer than the basal ones. Jan Willem


Nikita Vikhrev	#5 Posted on 20-11-2005 11:00
Member Location: Posts: 9193 Joined: 24.05.05	Thank you Jan, I hope I found your differences. Seta on added image is vibrisae or not? Nikita Nikita Vikhrev - Zool Museum of Moscow University


Jan Willem	#6 Posted on 21-11-2005 07:27
Member Location: Posts: 2122 Joined: 24.07.04	Hi Nikita, Yes you are right, that is a vibrissa. It is not as obvious in all species of the genus Geomyza though. You will get enough experience quickly enough to separate the two genera (Geomyza and Opomyza) by their overall appearance. Jan Willem


Nikita Vikhrev	#7 Posted on 21-11-2005 07:57
Member Location: Posts: 9193 Joined: 24.05.05	Thank you Jan, I'll do my best. Nikita Vikhrev - Zool Museum of Moscow University