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Diptera.info :: General Diptera forums :: Methodology
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Visualizing and defining costal breaks
kschnei
#1 Print Post
Posted on 12-07-2019 18:27
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Location: California
Posts: 4
Joined: 13.02.08

Hi all,

I'm fairly new to keying Diptera. It's clear that costal breaks are both important and difficult to see at times. Can someone give me tips on how to best see costal breaks? I have a scope with a rather weak transmitted light at the base, do I need to get a more powerful light source underneath the specimen? And do I need to see a complete break in the vein, or just lack of pigment, or...?

Thanks!
Ken
 
Tony Irwin
#2 Print Post
Posted on 12-07-2019 20:47
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Location: Norwich, England
Posts: 5825
Joined: 19.11.04

The key thing when viewing coastal breaks is to view at the correct angle. Looking at a flat wing at 90 degrees seldom works. Hold the specimen at an angle, so that you are looking obliquely towards the base of the wing. It takes some practice, so find a specimen which you know should have costal breaks, and work on that first. Good luck! Smile
Tony
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Tony Irwin
 
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Date and time
25 August 2019 04:46
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25.07.19 15:13
@Paul Beuk Thanks mate!! Best wishes!

22.07.19 15:09
Where are the meaning abbreviations of Lindner's series Die Fliegen der Palaearktischen Region, ie. f1: anterior femur, ...and what about "p"? (I don't possess volume I)

17.07.19 19:37
Yup, you can view the wing from above (dorsal side) and from beneath (ventral side).

16.07.19 13:31
Hey Dipterists! Quick Question: Vein r2+3 bare beneath. I've always assumed that this is below as in when you look at the wing flat. Am I right? Thank youuuuu! Pfft

18.06.19 08:07
TumbsUp

14.06.19 22:21
Thank you Elisabeth Wink

12.06.19 13:47
NICE TO SEE YOU BACK STEPHANE!

11.06.19 14:22
Thanks to you also Paul.

04.06.19 13:15
But thanks!

04.06.19 13:14
Old? Young!

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