Posted by Jan Willem on 19-11-2005 22:02
#4
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