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Spider Fangs
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NikonUser



Joined: 04 Sep 2008
Posts: 2528
Location: southern New Brunswick, Canada

PostPosted: Sun Dec 16, 2012 6:54 pm    Post subject: Spider Fangs Reply with quote

Ventral view of a pair of chelicerae showing the terminal fangs and the crushing teeth.
The fangs have an internal canal through which the spider passes venom, the exit hole can be seen as a pale spot just before the tip of each fang.
The two rows of prey-crushing teeth on each chelicera are offset. Between each row is a groove into which fits a fang. I can image that as the fang closes bits of crushed prey are squeezed out between the gaps in the teeth. If the teeth were opposite each other there would be no room for prey bits-and-pieces to be squeezed out.
The teeth appear to have a complex shape, maybe a pyramid or perhaps 3-sided.
I'm glad these things don't hunt humans, or cats and dogs.

20x ELWD Nikon M Plan on bellows at about 15x magnification, Flash, stryrofoam diffuser, ZS PMax. D600.
Image is intentionally overexposed to show teeth details; at a decent exposure the fangs and particularly the teeth come out black and featureless.



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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.”
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The Poet at the Breakfast Table.

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dissent



Joined: 10 Oct 2012
Posts: 144
Location: Illinois

PostPosted: Sun Dec 16, 2012 7:28 pm    Post subject: Reply with quote

Excellent photo. Makes me very glad I am not a potential prey item.
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"Truth is stranger than fiction, but it is because Fiction is obliged to stick to possibilities. Truth isn't." - Mark Twain
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Charles Krebs



Joined: 01 Aug 2006
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Location: Issaquah, WA USA

PostPosted: Sun Dec 16, 2012 10:23 pm    Post subject: Reply with quote

Excellent. Nicely done!
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snic320



Joined: 17 May 2011
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PostPosted: Mon Dec 17, 2012 2:10 am    Post subject: Reply with quote

Very good idea!, nicely done!
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cappo



Joined: 05 Dec 2012
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Location: Redondo Beach, CA

PostPosted: Mon Dec 17, 2012 11:16 am    Post subject: Reply with quote

Amazing photo. Cool
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NikonUser



Joined: 04 Sep 2008
Posts: 2528
Location: southern New Brunswick, Canada

PostPosted: Mon Dec 17, 2012 2:19 pm    Post subject: Reply with quote

Thanks everyone for the feedback.
I isolated a fang and photographed it on my BHS. 62.5x on sensor. DIC.
Note the 2 rows of peg-like 'teeth' bordering a groove at the base of the fang.
The tip is grooved on the outer surface, and the venon opening can be seen.


_________________
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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spongepuppy



Joined: 26 Nov 2012
Posts: 82
Location: Sydney, Australia

PostPosted: Mon Dec 17, 2012 3:47 pm    Post subject: Reply with quote

Spectacular. Any idea what sort of spider these are from?
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Rollin



Joined: 11 Jan 2011
Posts: 33
Location: Belgium

PostPosted: Mon Dec 17, 2012 5:09 pm    Post subject: Reply with quote

Impressive, both the subject and the picture!
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Ecooper



Joined: 06 Jul 2012
Posts: 217
Location: Vancouver

PostPosted: Mon Dec 17, 2012 9:45 pm    Post subject: Reply with quote

Utterly spectacular! What species are they from?
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NikonUser



Joined: 04 Sep 2008
Posts: 2528
Location: southern New Brunswick, Canada

PostPosted: Tue Dec 18, 2012 5:42 am    Post subject: Reply with quote

Thanks guys.
Spider ID seems more difficult than insect ID; I'm just starting. Found a great book:
http://www.amazon.ca/Spiders-North-America-Identification-Manual/dp/0977143902/ref=sr_1_2?s=books&ie=UTF8&qid=1355834274&sr=1-2

and the best I can come up with for an ID is a Nursery Web Spider Family: Pisauridae, maybe a Pisaurina sp.
_________________
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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DQE



Joined: 08 Jul 2008
Posts: 1653
Location: near Portland, Maine, USA

PostPosted: Tue Dec 18, 2012 12:52 pm    Post subject: Reply with quote

I am unable to see any of the photos linked in this thread. I then turned off most of the things that might have suddenly begun interfering with the forum, but as I expected this had no effect.

Am I the only one who can't see the photos in this thread??? I can see all the photos in other threads on this forum.
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"Diffraction never sleeps"
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rjlittlefield
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Joined: 01 Aug 2006
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Location: Richland, Washington State, USA

PostPosted: Tue Dec 18, 2012 1:17 pm    Post subject: Reply with quote

DQE wrote:
I am unable to see any of the photos linked in this thread. I then turned off most of the things that might have suddenly begun interfering with the forum, but as I expected this had no effect.

Am I the only one who can't see the photos in this thread??? I can see all the photos in other threads on this forum.

There seems to be some problem with image permissions at the moment. I'm getting weird results in other places also.

--Rik
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DQE



Joined: 08 Jul 2008
Posts: 1653
Location: near Portland, Maine, USA

PostPosted: Tue Dec 18, 2012 5:08 pm    Post subject: Reply with quote

rjlittlefield wrote:
DQE wrote:
I am unable to see any of the photos linked in this thread. I then turned off most of the things that might have suddenly begun interfering with the forum, but as I expected this had no effect.

Am I the only one who can't see the photos in this thread??? I can see all the photos in other threads on this forum.

There seems to be some problem with image permissions at the moment. I'm getting weird results in other places also.

--Rik


All photos are visible now.
----------------------------------------------

Delightful photos. I love the lighting and the overall appearance as well as the detail.
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"Diffraction never sleeps"
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rjlittlefield
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Joined: 01 Aug 2006
Posts: 17698
Location: Richland, Washington State, USA

PostPosted: Tue Dec 18, 2012 5:11 pm    Post subject: Reply with quote

DQE wrote:
All photos are visible now.

Yep. More details at http://www.photomacrography.net/forum/viewtopic.php?t=19015.

--Rik
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andre reichmann



Joined: 15 Aug 2012
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PostPosted: Sat Dec 22, 2012 4:16 am    Post subject: Reply with quote

very nice stuff.
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