Zosterodasys transversus

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ImperatorRex
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Zosterodasys transversus

#1 Post by ImperatorRex » Wed Mar 11, 2020 10:07 pm

I would like to present a ciliate, I assume this is Zosterodasys transversa (Kahl, 1928) Foissner et al., 1994.
I was first confused and thought this ciliate is Trithigmostoma cucullulus, Both ciliates have a comparable body shape, have a distinctive mouth funnel and impress by numerous eaten diatoms, which sometimes fill the whole body length of the ciliate:

Image
Two specimens of different sizes from Z. transverses. A size of 130-250 µm is mentioned in the Ciliaten Atlas.

The color of the eaten diatomae make them quite interesting to observe, on the other hand, the numerous diatoms also hide many details, making documentation difficult and only possible to a limited extent. Nevertheless I would like to show some photos here. As far as I interpret it correctly, the details shown fit on Zosterodasys transversa. I am very grateful for hints, comments and corrections.

Image
R = Reuse
Ma = Makronucleus
Mi = Mikronucleus

Image
M = Cytostom (mouth).
Sy = Synhymenium.
R = the cage (?) consists of 12-18 strong rods which are bent in front like knees. In Trithigmostoma they have 2 small teeth in the front.

I would like to cross link directly to Ole Riemanns photo that he shared in the german forum for Trithigmostoma : I think you can clearly see the 2 small teeth mentioned also by Foissner in his Ciliate Atlas:
https://www.mikroskopie-forum.de/pictur ... 980820.jpg

Sources:
Ole Riemann: Blue-green algae camp biocoenosis (supplemented on 15.10.) - https://www.mikroskopie-forum.de/index. ... #msg222166

Martin Kreutz: Trithigmostoma cucullulus - https://www.mikroskopie-forum.de/index. ... 1#msg28101

Foissner's Ciliate Atlas, Volume III, page 421.
Last edited by ImperatorRex on Thu Mar 12, 2020 5:50 pm, edited 2 times in total.

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75RR
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Re: Zosterodasys transverses

#2 Post by 75RR » Wed Mar 11, 2020 10:17 pm

Nice sequence and detective work!

Can't be easy being a diatom
Zeiss Standard WL (somewhat fashion challenged) & Wild M8
Olympus E-P2 (Micro Four Thirds Camera)

Bruce Taylor
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Re: Zosterodasys transverses

#3 Post by Bruce Taylor » Wed Mar 11, 2020 11:13 pm

Very nice! Great work locating and identifying the synymenium. Another useful clue for Zosterodasys is the highly vacuolated cytoplasm, visible in several of your images.

One small detail...note that the current correct species name is Z. transversus (with a "u"). The spelling problem is addressed here: http://yadda.icm.edu.pl/yadda/element/b ... ticle-3941

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ImperatorRex
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Zosterodasys transversus

#4 Post by ImperatorRex » Thu Mar 12, 2020 5:48 pm

Thank you 75RR and Bruce.
Bruce Taylor wrote:
Wed Mar 11, 2020 11:13 pm
One small detail...note that the current correct species name is Z. transversus (with a "u"). The spelling problem is addressed here: http://yadda.icm.edu.pl/yadda/element/b ... ticle-3941
Thank for the hint Bruce! I have corrected the subject header accordingly. It is also a very interesting article that provides many insights and details. Thanks a lot!

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