Gallery Links
Users Online
· Guests Online: 26

· Members Online: 1
weia

· Total Members: 4,950
· Newest Member: JeffersonA
Forum Threads
Theme Switcher
Switch to:
Last Seen Users
· weiaOnline
· Tony Irwin00:09:33
· JCobain00:16:38
· RamiP00:20:36
· Reimund Ley00:21:33
· ESant01:02:38
· smol01:04:43
· Haleun01:07:39
· Carnifex01:20:21
· RE Niks01:23:55
Latest Photo Additions
View Thread
Diptera.info :: Miscellaneous :: General queries
Who is here? 1 guest(s)
 Print Thread
why are eyes shaped?
Sara21392
#1 Print Post
Posted on 15-11-2010 09:45
User Avatar

Member

Location:
Posts: 1445
Joined: 07.11.10

Hi!
It is a picture of Vespidae, we knew that all of the insects have compound eyes which formed of numerous of ommatidia! I have a question! If you notice in this image, you get noticed about these eyes, why are they shaped? Are they ommatidium or another things? Thank you

Sara (21392)

aria.kcc.shirazu.ac.ir/~bm821384/DSC06604.JPG
 
ChrisR
#2 Print Post
Posted on 15-11-2010 09:56
User Avatar

Administrator

Location: Reading, England
Posts: 7699
Joined: 12.07.04

Welcome to the forum Sara ... I can't answer your question but this isn't really to do with identifying Diptera so I will move the thread to a more appropriate forum, such as the General queries area Wink
Edited by ChrisR on 15-11-2010 09:57
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.
 
http://tachinidae.org.uk
Sara21392
#3 Print Post
Posted on 15-11-2010 11:51
User Avatar

Member

Location:
Posts: 1445
Joined: 07.11.10

Oh! I'm sorryawkward, I'm a newcomer, because I got it wrong!Frown thanks a lot for your attention and lead me!Smile
Edited by Sara21392 on 15-11-2010 11:56
Sincerely yours
Sara
 
ChrisR
#4 Print Post
Posted on 15-11-2010 12:54
User Avatar

Administrator

Location: Reading, England
Posts: 7699
Joined: 12.07.04

No problem Smile I re-read your question and I think I understand now. Basically the dark shapes that you see on insect's eyes sometimes are an optical effect due to the structure of the ommatidia and the way that light strikes them and then is reflected back to the observer.

You can think of each ommatidium as a transparent cylinder and thousands of similar cylinders are packed together but, as the eye surface curves each cylinder points in a slightly different direction to its neighbours. Generally speaking, light is either bounced off the ommatidia up to your eye (giving you the impression of colour) or when you are looking down directly into the ommatidia it vanishes down into the cylinder and doesn't bounce back out (giving you a black/dark patch). Smile
Edited by ChrisR on 15-11-2010 12:56
Manager of the UK Species Inventory in the Angela Marmont Centre for UK Biodiversity at the Natural History Museum, London.
 
http://tachinidae.org.uk
Sara21392
#5 Print Post
Posted on 15-11-2010 16:23
User Avatar

Member

Location:
Posts: 1445
Joined: 07.11.10

Thank you very very much!Smile now a question occurred to me!! This insect exist numerous ommatidia, like many other insects; well, against the large number of ommatidia, why number of optical effects are low and so large? This intensive eye, does not conform with state, slightly! Unless, we accept that, optical reflections state, current only in some ommatidia! Doesn't it?FrownShock
Edited by Sara21392 on 07-12-2010 16:30
Sincerely yours
Sara
 
Jump to Forum:
Similar Threads
Thread Forum Replies Last Post
Stalk eyes fly from North east India Diptera (adults) 3 10-11-2023 18:25
Red eyes asilid Diptera (adults) 2 11-09-2023 17:08
Disctinctive arrow-shaped pattern on abdomen => Odontomyia angulata Diptera (adults) 4 25-07-2023 16:35
Pallopteridae? triangular eyes in male Diptera (adults) 4 27-05-2023 07:23
Small Black fly with big Eyes => Microphor (Dolichopodidae) Diptera (adults) 5 25-04-2023 19:07
Date and time
28 March 2024 15:27
Login
Username

Password



Not a member yet?
Click here to register.

Forgotten your password?
Request a new one here.
Temporary email?
Due to fact this site has functionality making use of your email address, any registration using a temporary email address will be rejected.

Paul
Donate
Please, help to make
Diptera.info
possible and enable
further improvements!
Latest Articles
Syrph the Net
Those who want to have access to the Syrph the Net database need to sign the
License Agreement -
Click to Download


Public files of Syrph the Net can be downloaded HERE

Last updated: 25.08.2011
Shoutbox
You must login to post a message.

07.03.24 00:01
Some flies preserved in ethanol and then pinned often get the eyes sunken, how can this be avoided? Best answer: I usually keep alcohol-collected material in alcohol

17.08.23 15:23
Aneomochtherus

17.08.23 13:54
Tony, I HAD a blank in the file name. Sorry!

17.08.23 13:44
Tony, thanks! I tried it (see "Cylindromyia" Wink but don't see the image in the post.

17.08.23 11:37
pjt - just send the post and attached image. Do not preview thread, as this will lose the link to the image,

16.08.23 08:37
Tried to attach an image to a forum post. jpg, 32kB, 72dpi, no blanks, ... File name is correctly displayed, but when I click "Preview Thread" it just vanishes. Help!

23.02.23 21:29
Has anyone used the Leica DM500, any comments.

27.12.22 21:10
Thanks, Jan Willem! Much appreciated. Grin

19.12.22 11:33
Thanks Paul for your work on keeping this forum available! Just made a donation via PayPal.

09.10.22 17:07
Yes, dipterologists from far abroad, please buy your copy at veldshop. Stamps will be expensive, but he, the book is unreasonably cheap Smile

Render time: 0.65 seconds | 189,854,272 unique visits