The subtleties of fly ID's - stereo pair added

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NikonUser
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Location: southern New Brunswick, Canada

The subtleties of fly ID's - stereo pair added

Post by NikonUser »

A couple of warm days brought out a few overwintering flies including this small (6 mm) specimen.
A member of the House fly family (Muscidae), genus Caricea.

Final key characters for this genus:
1: 2 pairs of reclinate orbital bristles, the anterior pair situated at
about the middle of the frons and well before level of anterior ocellus.
2:frons with 2 pairs of inclinate frontal bristles.


Head shot: Nikon 4x Plan Achro objective (at 7.1x), 81 frames @ 0.01 mm, ZS PMax
Image
Image
Last edited by NikonUser on Tue Mar 16, 2010 3:03 am, edited 3 times in total.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

Barry
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Location: Netherlands

Post by Barry »

Very nice images - with which objective was the top one shot; Micro-nikkor 105/4?

Best wishes,
Barry

Eric F
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Location: Sacramento, Calif.

Post by Eric F »

Absolutely fantastic fly photos NU!

Eric

NikonUser
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Location: southern New Brunswick, Canada

Post by NikonUser »

Thanks, Barry and Eric.

Full lateral is with a Micro Nikon 105MF 2.8 @ f/8 on lens; 33 frames @ 0.1 mm. ZS PMax.

Both with styrofoam cup diffuser/single flash.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

Online
Charles Krebs
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Contact:

Post by Charles Krebs »

NU,

These look great! Wonderful details!

NikonUser
Posts: 2588
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Post by NikonUser »

Thanks Charles. Good to see some bug life after 4 months of Winter.
Counting bristles is a bit easier than dissecting genitalia but the latter may be needed to get to the species level.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

LordV
Posts: 1568
Joined: Thu Nov 22, 2007 10:28 am
Location: UK

Post by LordV »

Wonderful stacks !
Have to admit i gave up on definitive ID's for flies when told I would have to dissect out the testicles to be certain :)
Brian V.
www.flickr.com/photos/lordv
canon20D,350D,40D,5Dmk2, sigma 105mm EX, Tamron 90mm, canon MPE-65

RogelioMoreno
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Location: Panama

Post by RogelioMoreno »

Beautiful images, excellent details.

Rogelio

NikonUser
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Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Post by NikonUser »

Thanks Brian & Rogelio.

Brian: 'Dissecting genitalia' is a bit of a misnomer. The interesting bits in males are really external but they tend to tuck them into the abdomen (modesty?).

I find the variation in the detail, between species, fascinating. Why would otherwise identical looking species, particularly in males, show such differences in external genitalia?

They also make great macro subjects.

left image: Nikon 20x microscope objective on bellows, 38 frames @ 0.005 mm; ZS PMax
right image: Nikon 10x microscope objective on bellows, 28 frames@0.01 mm; ZS PMax.
Image
NU10-007
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

booter
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Joined: Thu Feb 25, 2010 3:56 pm
Location: Illinois

Post by booter »

Chaetotaxy made fun! Great images NU.

Scott

rjlittlefield
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Post by rjlittlefield »

I haven't spent much time staring at fly genitals, but this one seems similar to some butterflies.

The structures are quite complex.

Any chance of getting that right side structure in stereo?

--Rik

NikonUser
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Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Post by NikonUser »

Unlike moth genitalia which can be flattened into practically 2-dimensions, some fly genitalia are more like spheres with all sorts of bits and pieces. They probably are best seen as stereo pairs. however, I have never been able to see anything but 2 separate images when looking at stereo pairs.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

rjlittlefield
Site Admin
Posts: 20757
Joined: Tue Aug 01, 2006 8:34 am
Location: Richland, Washington State, USA
Contact:

Post by rjlittlefield »

Thanks to NU's generosity and the miracle of email, here are a couple of synthetic 3D views of this genitalia.

Rocking animations:

Image Image

Stereo pair (crossed eye):

Image

NU tells me this was a wet mount, in glycerine with no cover glass. Hairs sticking out of the surface layer of glycerine show up as very bright highlights. Those disrupt the off-axis views that we need for stereo. The rotating versions are straight out of PMax (except for levels adjustment and animation in ImageReady), but I had to do some manual cleanup in Photoshop to get the stereo pair that you see here.

This is a good test set -- interesting enough to get me excited, but troublesome enough to prompt some future mods to the software.

If I can get something that NU can see in stereo, now that'll be cool!

--Rik

LordV
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Joined: Thu Nov 22, 2007 10:28 am
Location: UK

Post by LordV »

NikonUser wrote:Unlike moth genitalia which can be flattened into practically 2-dimensions, some fly genitalia are more like spheres with all sorts of bits and pieces. They probably are best seen as stereo pairs. however, I have never been able to see anything but 2 separate images when looking at stereo pairs.
NU re- 3-d cross-eye stereograms -have you tried sitting about 2 feet away from the screen and then holding a pencil or finger about 4" in front of your nose and focusing on that. If you can do that you should see a new image in the middle of the stereo pair. It's then a matter of trying to slide the finger/pencil out of the way whilst keeping the third image in view. With a bit of brain training you learn to lock this third image.
Brian V.
www.flickr.com/photos/lordv
canon20D,350D,40D,5Dmk2, sigma 105mm EX, Tamron 90mm, canon MPE-65

NikonUser
Posts: 2588
Joined: Thu Sep 04, 2008 2:03 am
Location: southern New Brunswick, Canada

Post by NikonUser »

Brian:
Making slow progress. The pencil trick gives me 3 out of focus images images (4 counting the pencil), and a temporary head ache. As I slide the pencil away the 3rd middle bug image disappears with it.
Could be my brain is too old to train.
NU.
student of entomology
Quote – Holmes on ‘Entomology’
” I suppose you are an entomologist ? “
” Not quite so ambitious as that, sir. I should like to put my eyes on the individual entitled to that name.
No man can be truly called an entomologist,
sir; the subject is too vast for any single human intelligence to grasp.”
Oliver Wendell Holmes, Sr
The Poet at the Breakfast Table.

Nikon camera, lenses and objectives
Olympus microscope and objectives

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