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Wood tick

 
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Troels



Joined: 15 Feb 2016
Posts: 233
Location: Denmark, Engesvang

PostPosted: Sat Feb 11, 2017 3:57 pm    Post subject: Wood tick Reply with quote

Outside everything is covered with snow and ice.
It is time for exploring the content of the freezer.

In a little jar I found this Ixodes (probably ricinus) from last summer.
The real challenge was to mount it on a piece of grass.



When alive the animal would cover its sucking apparatus (the proboscus) with the two darks shells (palps), untill it should be used. But here we get a glimpse of the barbs on the proboscus.

Troels
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abpho



Joined: 17 Aug 2011
Posts: 1423
Location: Earth

PostPosted: Sat Feb 11, 2017 8:07 pm    Post subject: Reply with quote

Nice work. Those are nasty little creatures. As a dog owner I am always worried about ticks and lime disease.
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banania



Joined: 16 Sep 2013
Posts: 142

PostPosted: Sat Feb 11, 2017 11:38 pm    Post subject: Reply with quote

Nice, how did you manage the mounting?
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Troels



Joined: 15 Feb 2016
Posts: 233
Location: Denmark, Engesvang

PostPosted: Sun Feb 12, 2017 12:42 pm    Post subject: Reply with quote

Thanks

I feared the mounting would be very difficult, including messing with glue and tiny needles. Fortunately the creature was surprisingly cooperative. Before it took its last breath it curled its leg inwards creating a nice little tunnel along the ventral side.

First I straightened the first pair of legs somewhat out to simulate its natural attitude. Then I found a piece of grass with round "stem" and grabbed it with a pair of tweezers. Then I turned the animal on its back, fixed it with another pair of tweezers and deliberately pushed the gras stem through the tunnel between the curled inward legs.

I could never have done this without the use of a stereomicroscope at 20x.

Then I could push the animal along the gras to a thicker part of the stem where the animal would cling to the grass by its own resistance and fix the upper end of the gras to a little horizontal bar.

I would never have managed to manipulate its tiny legs into something like a normal walking position.

Troels
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Troels



Joined: 15 Feb 2016
Posts: 233
Location: Denmark, Engesvang

PostPosted: Mon Feb 13, 2017 4:43 pm    Post subject: Reply with quote

Reading my own last comment I felt a little stupid talking about details not visible in the picture.

So here comes one more (and in my own opinion better) picture of the much hated animal showing the way I mounted it on the straw. I was tempted to delete the first picture, but since the proboscis in that case is more visible I will leave it.

Bigger on Flickr

And as a bonus I offer a stereo version:


Troels
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Saul



Joined: 31 Jan 2011
Posts: 760
Location: Naperville, IL USA

PostPosted: Mon Feb 13, 2017 5:28 pm    Post subject: Reply with quote

Nice stereo, great result
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ChrisR
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Joined: 14 Mar 2009
Posts: 6840
Location: Near London, UK

PostPosted: Mon Feb 13, 2017 7:02 pm    Post subject: Reply with quote

Yes, I prefer that angle too. Stereo works well!
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MiB



Joined: 18 Dec 2012
Posts: 63
Location: Vienna

PostPosted: Wed Mar 08, 2017 4:42 pm    Post subject: Reply with quote

Wow... Amazing photo - congratulations!! Smile
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Troels



Joined: 15 Feb 2016
Posts: 233
Location: Denmark, Engesvang

PostPosted: Thu Mar 09, 2017 7:42 am    Post subject: Reply with quote

Thanks to all!
I appreciate it.

Troels
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davholla



Joined: 26 Apr 2016
Posts: 135

PostPosted: Thu Mar 09, 2017 8:33 am    Post subject: Reply with quote

Very nice photos of an unusual subject.
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markd



Joined: 30 Jan 2016
Posts: 26

PostPosted: Mon Mar 20, 2017 9:13 pm    Post subject: Reply with quote

Is there some standard way to stereo view these stereo images?

Nice shot, though I instantly recognized that beast as dead and a bit dessicated. I get ticks almost every day off my dog and often watch them alive under the stereo. At peak season I've pulled dozens of tiny babies off the dog and arranged them into a decorative army on a slide. I even once pulled one off myself that had attached and was a bit engorged -- yuk!
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abpho



Joined: 17 Aug 2011
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PostPosted: Tue Mar 21, 2017 8:13 am    Post subject: Reply with quote

I hope none were carrying Lyme disease. That stuff will mess you up for life.
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Troels



Joined: 15 Feb 2016
Posts: 233
Location: Denmark, Engesvang

PostPosted: Tue Mar 21, 2017 9:22 am    Post subject: Reply with quote

markd wrote:
Quote:
I instantly recognized that beast as dead and a bit dessicated

You are certainly right, but if you conclude from the strange appearence of the "eyes", you are on the wrong path.

This animal has no (visible) eyes. The strange structure of the areas where the eyes are supposed to be has other functions which I don't know. But they have the same appearence in the fresh animal.

Quote:
Is there some standard way to stereo view these stereo images?

For most people it requires some practice. Some never get the knack of it.
My advise for starters would be:

1) Try to move your nose close to the screen so the picture is impossible to focus at. Move your head slowly backwards while trying to focus . You wil se several blurred pictures. As the distance slowly grows you will reach a point where you see three focused pictures side by side. Koncentrate on the central picture and try to forget the two others. Try to focus a different parts of this picture. If you succeed you will experience the 3D effect.

2) The two pictures should not appear too big: If you use a big a screen (with low resolution), try to move a little backwards. Narrower pictures are easier than wide ones.

3) It is easier if there is a distinct border between the two pictures.

This is for cross eyed viewing only.
If you have stereo cards made for viewing in a stereo viewer this will not work. In the cross eyed version the left and right pictures are switched.

Troels
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markd



Joined: 30 Jan 2016
Posts: 26

PostPosted: Tue Mar 21, 2017 9:37 am    Post subject: Reply with quote

No, it wasn't the eyes. It was an analytical conclusion at all. Just immediate instinct, because I've looked at so many live ticks.

Thanks for the stereo tip. No luck on first try, but I'll try more.
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