Thread subject: Diptera.info :: Rondania (dispar?) from northern Spain
Posted by ChrisR on 07-10-2009 22:21
#1
This was sent to me from Galicia, Spain today and I was wondering if it might be a female
Rondania dispar? Are there any other alternatives? :)
Posted by ChrisR on 07-10-2009 22:21
#2
another angle ...
Posted by ChrisR on 07-10-2009 22:21
#3
another angle ...
Posted by neprisikiski on 08-10-2009 18:07
#4
should be dimidiata, tibiae are dark
Posted by ChrisR on 08-10-2009 18:19
#5
Ahh, excellent - thanks :) Which literature are you using? Is there anything better than the Central European key? Interstingly, mine keyed to
R.cucullata in the main key because it has 2 ia and they are wider apart than the distance of the anterior one to the suture. Might be a weak couplet that needs a margin note.
Posted by Zeegers on 13-10-2009 20:22
#6
The colouration of the legs is unreliable, at least in the dutch material I've seen. The relative length of the stalk might be a better feature to use.
Theo
Posted by ChrisR on 13-10-2009 20:29
#7
Thanks Theo - I have made a margin-note and have just checked the length of the petiole. It is <0.24x (actually just <0.2x) the length of the median vein after the bend so I think that confirms
R.dimidiata :)
Posted by ChrisR on 11-06-2010 15:27
#8
As a follow-up - the original determination of
Rondania dispar has been confirmed by Peter Tschorsnig (it is definitely not
R. dimidiata) :)
Peter said:
the key in Herting & Tschorsnig is insufficient, because the length of the petiole and the colouration of the tibia overlap in the two species, but R. dimidiata has nearly always 4 postsutural dc and R. dispar has 3; unfortunately also the latter feature is not entirely constant, because one of the two specimens from Ourense has 3 dc at one side and 4 dc at the other
Edited by ChrisR on 11-06-2010 15:29