Colpoda?

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hans
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Colpoda?

#1 Post by hans » Fri Nov 20, 2020 8:02 pm

Apparently very common but just started showing up in my cultures from dew-watered spots in the last couple days. Finally enough around to get decent video, were too difficult to track down and follow around when they were more scarce:
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janvangastel
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Re: Colpoda?

#2 Post by janvangastel » Sat Nov 21, 2020 7:34 am

I don't think its colpodea. I don't know the size, but to me it looks more like a chilodonellid.

hans
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Location: Southern California

Re: Colpoda?

#3 Post by hans » Sat Nov 21, 2020 9:05 am

Sorry, forgot to specify size: 40x objective, camera is covering most of the FOV diagonally, and the ciliates are around 30 by 15 by 10 um.

Hadn't seen Chilodonellidae but some photos do look similar. The Colpoda guess I was basing a lot on the style of movement which looks very similar to some videos on Wikipedia and YouTube, assuming those are correctly identified.

Bruce Taylor
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Re: Colpoda?

#4 Post by Bruce Taylor » Sat Nov 21, 2020 1:01 pm

These are in the order Colpodida, without question. That invagination on the margin of the cell (the opening of the vestibulum, leading to the mouth) is very distinctive, and the style of movement (which you noted) is typical. Members of genus Colpoda are common and likely, but there are several lookalikes (Bresslaua, Krassniggia, Tillina, etc.). Reliable identification to genus would require a very close inspection of the oral structures (and, for me at least, a review of the literature! :D) .

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