Diptera.info

Posted by Sundew on 22-09-2011 22:44

Hi,
This evening I was visited by a yellow Lauxaniid fly that showed few thoracal bristles, especially presuturally. Though some might have got lost, I do not find a good counterpart, neither in my collection nor in the gallery. So I really need help (I miss Katka Dvorakova!). BTW, the arista is finely haired.
Thanks for any opinion, Sundew

Edited by Sundew on 26-09-2011 18:36

Posted by Sundew on 24-09-2011 23:48

Yesterday I took some more photos of these flies, they seem to be frequent at the moment (in contrast to the Lauxaniid experts!). Meanwhile I waded through the forum archive to learn more about the yellow species and would now declare mine a Meiosimyza. I tended strongly to M. rorida as an autumnal species. However, I was unable to detect the av ctenidia on f1 that Roger depicted so nicely (http://www.dipter...ost_142793), and also the thoracal chaetotaxy is difficult to interpret. I can hardly see dc rows (even if the obviously broken setae were included) and have difficulties to spot the suture. Therefore the genus character "no presut dc" makes me trouble. By jizz, however, I would label the flies "Meiosimyza spec." and would be grateful for correction, if necessary!
Thanks, Sundew

Posted by Sundew on 26-09-2011 13:13

As there is still experts' silence, I'd like to make a final decision myself and identify this Meiosimyza as M. rorida. After another careful examination of all pictures I find the following decisive characters:
(1) two sternopleural setae,
(2) row of anteroventral spines on fore femur (both seen on upper picure),
(3) acrostichal bristles on thorax irregularly quadriserial with those of two middle rows longer (in the lower picture, dorsocentral rows bold red, inner acrocentral rows bold blue, outer made of shorter bristles blue broken lines).
If there are any justified objections to this argumentation, I'd happily accept them, if you remain silent, M. rorida is fixed.
Regards, Sundew (self-made Meiosimyzist)

Posted by Paul Beuk on 26-09-2011 14:04

If you had included that first picture in your last post in the original posts I think you would have received the answer immediately. ;)

Posted by Sundew on 26-09-2011 18:34

If, at the time of my first post, I already had known the genus and what peculiar characters were to detect for species ID I hadn't needed to post the query at all :D:D:D!
Here we have another example for how educational the reading of ancient threads is! ;)