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Is this Didinium?

 
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nanometer



Joined: 30 Apr 2016
Posts: 153
Location: Tucson, AZ

PostPosted: Sun Sep 30, 2018 10:02 pm    Post subject: Is this Didinium? Reply with quote

I've been trying to figure out what this is. Here are two [crappy] pics (40x phase) of the same body. It's about the right size for Didinium (~100um), but the body shape doesn't fit. Also, Didinium has the second row of cilia mid body where this is clearly on the posterior.

Thanks for any help! Steve



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Bruce Taylor



Joined: 23 Jun 2011
Posts: 779
Location: Wakefield, Quebec / Ottawa, Ontario

PostPosted: Mon Oct 01, 2018 4:53 am    Post subject: Reply with quote

No, it's a peritrich ciliate in its "swarmer" phase, with a posterior ciliary wreath. This ring of cilia is only present when the cell is traveling from place to place. In its feeding phase, the ciliate will be attached to the substrate by a stalk, joined to the narrow end of the cell (the posterior). The ring of cilia at the back end of the cell will disappear, and a mouth will open up at the front.

From the images here, we can't identify genus or even family...could be an epistylid, could be a vorticellid, etc.
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nanometer



Joined: 30 Apr 2016
Posts: 153
Location: Tucson, AZ

PostPosted: Mon Oct 01, 2018 6:00 am    Post subject: Reply with quote

Thanks Bruce. I had no idea about the life cycle that you have described. Time to read about it!
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Bruce Taylor



Joined: 23 Jun 2011
Posts: 779
Location: Wakefield, Quebec / Ottawa, Ontario

PostPosted: Mon Oct 01, 2018 7:25 am    Post subject: Reply with quote

nanometer wrote:
Thanks Bruce. I had no idea about the life cycle that you have described. Time to read about it!


A search on the term "telotroch" will produce results. Smile Most fully-formed telotrochs are somewhat more cylindrical in shape, but this individual might have been caught in transition.
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