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Equine Cyathostomin L3 Larvae

 
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micro_pix



Joined: 11 May 2012
Posts: 195

PostPosted: Tue May 28, 2019 4:19 pm    Post subject: Equine Cyathostomin L3 Larvae Reply with quote

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
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Location: Naperville, IL USA

PostPosted: Tue May 28, 2019 5:58 pm    Post subject: Reply with quote

Impressive
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Sumguy01



Joined: 28 Jan 2013
Posts: 1366
Location: Ketchikan Alaska USA

PostPosted: Tue May 28, 2019 7:55 pm    Post subject: Reply with quote

Very nice.
Thanks for sharing.
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Jacek



Joined: 02 Oct 2011
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Location: Poland

PostPosted: Tue May 28, 2019 9:47 pm    Post subject: Reply with quote

Very nice
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micro_pix



Joined: 11 May 2012
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PostPosted: Wed May 29, 2019 9:57 am    Post subject: Reply with quote

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
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Location: Rotterdam, the Netherlands

PostPosted: Wed May 29, 2019 12:15 pm    Post subject: Reply with quote

Very interesting series, Dave; beautiful details and well captured/identified.
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Olympusman



Joined: 15 Jan 2012
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PostPosted: Wed May 29, 2019 12:46 pm    Post subject: Worms Reply with quote

Beauty!

Mike
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micro_pix



Joined: 11 May 2012
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PostPosted: Thu May 30, 2019 3:46 am    Post subject: Reply with quote

Thanks for the kind comments.

Dave
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blepharopsis



Joined: 28 Nov 2014
Posts: 143
Location: Virginia, USA

PostPosted: Thu May 30, 2019 10:11 am    Post subject: Reply with quote

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

PostPosted: Thu May 30, 2019 1:12 pm    Post subject: Reply with quote

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
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Location: Lancashire. UK

PostPosted: Thu May 30, 2019 3:41 pm    Post subject: Reply with quote

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"
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KurtM



Joined: 16 Jul 2014
Posts: 78
Location: League City, Texas

PostPosted: Thu May 30, 2019 6:42 pm    Post subject: Reply with quote

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).
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Kurt Maurer
League City, Texas
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micro_pix



Joined: 11 May 2012
Posts: 195

PostPosted: Fri May 31, 2019 12:18 am    Post subject: Reply with quote

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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