Stentor or vorticella?

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janvangastel
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Stentor or vorticella?

#1 Post by janvangastel » Fri Jan 24, 2020 7:49 pm

Is this a stentor or a vorticella?
Last edited by janvangastel on Sun Jan 26, 2020 6:22 am, edited 1 time in total.

MicroBob
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Re: Stentor or vorticella?

#2 Post by MicroBob » Fri Jan 24, 2020 9:00 pm

Hi Jan,
the vorticellas I have seen had a body and a stem of continuous diameter, they were not conical like your animal. They contract their stem periodically and very fast to a spiral and then expand again.
A useful book might be "Das Leben im Wassertropfen". It can be an older edition if you want it cheap.

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janvangastel
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Re: Stentor or vorticella?

#3 Post by janvangastel » Sat Jan 25, 2020 6:51 am

Thank you. For the same reason you mention I thought it couldn't be a vorticella, but I thought that a stentor had a much wider opening, trumpet-like. But there are many species, so possibly there are some species with smaller openings.

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Re: Stentor or vorticella?

#4 Post by MicroBob » Sat Jan 25, 2020 12:21 pm

Hi Jan,
I would at least say it is a ciliate of some kind. It looks a lot like what is identified as stentor on Wikipedia: https://de.wikipedia.org/wiki/Trompetentierchen
The look though my books didn't bring a better idea of identification.

Bob

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75RR
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Re: Stentor or vorticella?

#5 Post by 75RR » Sat Jan 25, 2020 3:08 pm

I would go with Stentor as well.

Just a minor heads up ...

Many of us, and I include myself, use Vorticella which is a Genus, interchangeably with Peritrich which is the Order it belongs to.

My point is that not every Peritrich is a Vorticella and not every ciliate that looks like a vorticella is one.

There are a lot of ciliates in the order Peritrich.

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https://archive.org/details/1935AlfredK ... x/mode/2up
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actinophrys
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Re: Stentor or vorticella?

#6 Post by actinophrys » Sat Jan 25, 2020 5:04 pm

As everyone said, this is very much a Stentor. Besides the shape, your video gives a good look at how the actual cilia work – there is a series of membranelles that spiral clockwise into the mouth, plus rows of uniform cilia over the rest of the cell. Peritrichs like Vorticella have a few turns of finer oral cilia and at most one ring of body cilia in stalkless forms.

Stentor are very contractile, and you don't usually see the full flared trumpet shape when they are not anchored and feeding. Telling the species is more about colour, size, and the shape of the macronucleus. Around 1:20 it looks like yours might have a vermiform macronucleus, in which case it is probably S. roeselii, but I might be misinterpreting this.

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Wes
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Re: Stentor or vorticella?

#7 Post by Wes » Sat Jan 25, 2020 7:37 pm

75RR wrote:
Sat Jan 25, 2020 3:08 pm
I would go with Stentor as well.

Just a minor heads up ...

Many of us, and I include myself, use Vorticella which is a Genus, interchangeably with Peritrich which is the Order it belongs to.

My point is that not every Peritrich is a Vorticella and not every ciliate that looks like a vorticella is one.

There are a lot of ciliates in the order Peritrich.

See link:

https://archive.org/details/1935AlfredK ... x/mode/2up
I too am guilty of this crime. Thanks for bringing it up!

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