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micro_pix

Joined: 11 May 2012 Posts: 195
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Posted: Tue May 28, 2019 4:19 pm Post subject: Equine Cyathostomin L3 Larvae |
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These are L3 larvae (infective stage) of the equine cyathostomin (gut parasite), often referred to as Small Redworm. - the most prevalent parasite of adult horses.
Unlike free-living nematodes these parasitic larvae develop a sheath at the L3 stage which protects them from desiccation before they are ingested and enables them to get to the preferred section of the herbivore's gut.
There are 42 known species of cyathostomin that are found in horses and they are very difficult to identify to species level but the number and arrangement of the gut sections in the L3 stage larvae can be used to narrow the choice down. On the second image I've "enhanced" the gut sections to show the arrangement.
These are a "Type A" cyathostomin species, they are around 0.8mm long excluding the tail. The larvae were extracted using the Baermann technique.
Dave
Gut sections enhanced
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Saul

Joined: 31 Jan 2011 Posts: 1470 Location: Naperville, IL USA
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Posted: Tue May 28, 2019 5:58 pm Post subject: |
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Impressive |
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Sumguy01
Joined: 28 Jan 2013 Posts: 1380 Location: Ketchikan Alaska USA
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Posted: Tue May 28, 2019 7:55 pm Post subject: |
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Very nice.
Thanks for sharing. |
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Jacek

Joined: 02 Oct 2011 Posts: 5349 Location: Poland
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micro_pix

Joined: 11 May 2012 Posts: 195
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Posted: Wed May 29, 2019 9:57 am Post subject: |
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Here's a picture that shows the whole thing, it was difficult to get as it was moving so stacking wasn't an option.
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WalterD

Joined: 06 Jul 2015 Posts: 523 Location: Rotterdam, the Netherlands
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Posted: Wed May 29, 2019 12:15 pm Post subject: |
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Very interesting series, Dave; beautiful details and well captured/identified. _________________ www.waltermachielsen.com |
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Olympusman
Joined: 15 Jan 2012 Posts: 4271
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Posted: Wed May 29, 2019 12:46 pm Post subject: Worms |
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Beauty!
Mike _________________ Michael Reese Much FRMS EMS Bethlehem, Pennsylvania, USA |
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micro_pix

Joined: 11 May 2012 Posts: 195
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Posted: Thu May 30, 2019 3:46 am Post subject: |
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Thanks for the kind comments.
Dave |
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blepharopsis
Joined: 28 Nov 2014 Posts: 143 Location: Virginia, USA
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Posted: Thu May 30, 2019 10:11 am Post subject: |
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They can infect me anytime... Beautiful worms, awesome images! Is that a long undulating fin on their backs?? |
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micro_pix

Joined: 11 May 2012 Posts: 195
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Posted: Thu May 30, 2019 1:12 pm Post subject: |
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blepharopsis wrote: | They can infect me anytime... Beautiful worms, awesome images! Is that a long undulating fin on their backs?? |
Thanks!
The marked concertina effect is actually the outer sheath folding on the inside of the bends, you’ll notice it is smooth on the outside. I assume that this happens because it’s not elastic. When straight there is usually a little concertina on both sides. When they are dead they become completely straight.
Dave |
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grgh
Joined: 09 Mar 2013 Posts: 291 Location: Lancashire. UK
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Posted: Thu May 30, 2019 3:41 pm Post subject: |
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blepharopsis wrote: | They can infect me anytime... Beautiful worms, awesome images! Is that a long undulating fin on their backs?? |
take it from an old country fella, "you would not like these" _________________ used to do astronomy.
and photography.
Zeiss Universal Phase contrast.
Zeiss PMII |
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KurtM

Joined: 16 Jul 2014 Posts: 78 Location: League City, Texas
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Posted: Thu May 30, 2019 6:42 pm Post subject: |
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Impressive pix, and excellent info, thanks! Are you a vet, or doing this for a vet, per chance? Be interesting to know what drove you to making such fine portraits of these wee villains (another old country boy here). _________________ Cheers,
Kurt Maurer
League City, Texas |
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micro_pix

Joined: 11 May 2012 Posts: 195
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Posted: Fri May 31, 2019 12:18 am Post subject: |
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KurtM wrote: | Impressive pix, and excellent info, thanks! Are you a vet, or doing this for a vet, per chance? |
Hi Kurt,
The microscopy/photography is just a hobby.
Dave |
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