Posted by Dmitry Gavryushin on 21-05-2008 18:54
#1
I came quickly enough to
Hyperoscelididae (which I understand is
Canthyloscelidae now) in Stackelberg's family key. Now I'm pretty sure it's a
Hyperoscelis eximia. May 20, 2008, Naro-Fominsk, Moscow region, Russia. Size 5 mm.
Posted by Colobo on 03-06-2008 05:51
#3
Yes, it is almost certainly
Hyperoscelis eximia. However the best character for separating this species from the vicinous
H. veternosa (shape of dark pigmented part of base of vein M after Rohacek & Bartak 2007) is not clearly visible in this picture. Anyway, both species are flies of rare occurence !
Posted by Dmitry Gavryushin on 03-06-2008 10:18
#4
Many thanks Colobo. In Nagatomi and Saigusa (1984) two external distinguishing characters are mentioned (after Mamaev and Krivosheina (1969) and Hutson (1977)), that is: 1) vein between cells
SM and
P1 is shorter than (in
veternosa) or as long as (in
eximia) than that between cells
M and
P1, I understand that means corresponding lengths of
R4+5; 2) thickened part of the vein between cells
B and
P3 is parallel (in veternosa) or not parallel (in eximia) with vein
R1. I've checked the specimen and according to 1 it's rather
veternosa but according to 2 it's
eximia. These two are not very reliable characters, though.
Edited by Dmitry Gavryushin on 03-06-2008 10:18