Help ID Who is this ciliate? Scaphidiodon? Chilodontopsis?

[carlos.uruguay]

This ciliate measures about 150um long.
It has a large macronucleus visible in the video.
and a small protrusion similar to a 'tail'
Scaphidiodon? Chilodontopsis?
Who is it?
It was found in a small lake of freshwater called 'lago del Parque Rodo' in montevideo - uruguay.
I appreciate any information
Link:
http://www.youtube.com/watch?v=-OT7oq0IsNo
Regards
carlos

[Jacek]

[carlos.uruguay]

Thank you Jacek

[Protos]

Hi Carlos

Scaphidiodon lives in salted water. My guess is Chilodonella, Dragesco has described it with a curved posterior end (ciliés d'Afrique).
Another candidate is Trochilia

[carlos.uruguay]

Hi Protos
Thank you for take care of the problem.
I have thought very much about Chilodonella and Chilodontopsis
I think that its should be an option
Although the video ciliate has a very pronounced 'tail', which is not observed in Chilodonella or Chilodontopsis
Trochilia seems very small to me, the video ciliate is 150um long
In relation to Scaphidiodon, although it is of salt water, I quoted it for its very similar form
Regards
carlos

[carlos.uruguay]

New video of this ciliate:
http://www.youtube.com/watch?v=2lGd0QIfPvc
Regards
carlos

[Protos]

Hello Carlos,

I think Chilodonella is still matching according to me. Here is a drawing from Dragesco (Ciliés d'Afrique, p280) showing the tail


The tail may develop in certain conditions. This has been seen with other ciliates.

[RogelioMoreno]

Carlos,

Very nice video!

Rogelio

[RogelioMoreno]

Carlos,

Very nice video!

Rogelio

[carlos.uruguay]

Thanks you Rogelio.
Protos: very interesting data. I will put "Likely Chilodonella" in the title of the video.
In which cases can develop tail?
Thanks in advance

[carlos.uruguay]

Hello Carlos,
I think Chilodonella is still matching according to me. Here is a drawing from Dragesco (Ciliés d'Afrique, p280) showing the tail

The tail may develop in certain conditions. This has been seen with other ciliates.

Hi Protos.
I have been observing the topic. The Chilodonella that has 'tail' is Chilodonella caudata.
I have filmed it one or two times:
http://www.youtube.com/watch?v=KZPdgJuVEE0
and
http://www.youtube.com/watch?v=NcovDrHWTXc
It is smaller than that of the video
and it has the 'basket' clearly visible in its 'mouth'
My memory is bad and had forgotten these videos
So the doubt on this ciliated still present
Regards
carlos

[Protos]

You videos are very nice !

Getting back to the first one, it is certainly a Cyrtophorida.
Orthotrochilia sp (Deroux 1976) is both a marine and fresh water ciliate looking very much like it. (another candidate ?) Well described in the PP Grassé encyclopedia.

[Protos]

Hello Carlos Here come the figures from the PP Grassé encyclopedia about Orthotrochilia and other related ciliates

[carlos.uruguay]

Protos
Thank you very much for this important information and for sharing your knowledge!
Unfortunately I have not found more individuals to film them better. The only thing that still confuses me is that they measure about 150um
In the case of Dysteria she presents a hard shell
http://www.youtube.com/watch?v=SgjVULXcCH8
carlos

[Bruce Taylor]

Carlos & Phil, the "podite", or "cytoplasmic spine" in dysteriid ciliates like Orthotrochilia is a flexible ventral structure, used for attachment to the substrate. To me, this "tail" appears to be a dorsal feature.