Ciliate with big nose, Trachelius or Apotrachelius? (edited)

[carlos.uruguay]

In this video we see a round shape ciliate with a small 'proboscis'.
It has a depression in his body.
Many small vacuoles and a large vacuole that appears to be full of 'food'.
It measures about long 150um.
We assume that it belongs to the genus Trachelius or Apotrachelius
Its small size and its many small vacuoles does not seem to be Trachelius Ovum.
Found in a small lake of contaminated fresh water called 'lago del Parque Rodó' - Montevideo - Uruguay
Darkfield and polarized oblique light.
Link:
http://www.youtube.com/watch?v=TYQTb1V_O4Y
Regards
carlos

[fpelectronica]

Very nice

[Jacek]

Very nice

[carlos.uruguay]

Thanks Jacek and Francisco

[RogelioMoreno]

Nice video!

Rogelio

[Bruce Taylor]

Cute critter.

It's certainly small for either Trachelius or Apotrachelius (each of which has only one well-described species, but probably many more awaiting proper attention). However, the size of a single specimen is a weak character. Post dividers can be puny, for instance.

We don't see a macronucleus here (at least, I don't!), so Apotrachelius, which has small scattered macronuclei, seems possible. However, it's hard to be sure that a single macronucleus isn't hiding somewhere in there, so I would simply call this a "tracheliid" and wait to see more of 'em.

If you find another one, squash it under a coverslip with dots of vaseline in the corners, until you can clearly see the nuclei.

[carlos.uruguay]

Thanks again Bruce.
Hopefully find another.
You've seen the brown area at its rear end? Fat globules? Provides some data for the identification?

[carlos.uruguay]

The ciliate, similar to Trachelius ovum
It has some features that differentiate it:
Trachelius ovum has few vacuoles
This ciliate full of them
Trachelius ovum is enough more large
This is more small
Trachelius ovum does not have in its anterior zone fat globules that small increases are seen as a brown area
By what this ciliate appears to be from the same family as Trachelius but other genus and species
Probably Apotrachelius multinucleatus
who, in addition to the two previous basic features (many vacuoles and a 'brown' area to small increases)
It has many small macronucleos (almost impossible thing to my note given the large number of vacuoles)
I have attached some pictures of the diagram of Apotrachelius multinucleatus and video
The location of the 'mouth' is also different in Apotrachelius multinucleatus in Trachelius ovum but not seen in the video thus cannot take as fact
Best regards
Carlos

[

[Protos]

My guess: Trachelius subtilis

[carlos.uruguay]

Hi Protos.
Thank you for following my post and help me with them
The gender Trachelius has some different characteristics from the video ciliate
That of the video has similar characteristics to Apotrachelius
"Trachelius ovum does not have in its anterior zone fat globules that small increases are seen as a brown area"
"Trachelius ovum has few vacuoles
This ciliate full of them"
I would be remiss check for the presence of many small macronucleos to assure it with certainty.
As well Trachelius have only one spacie "Ovum"
Trachelius subtilis is now synonymous with Trachelius ovum.
"Trachelius subtilis Penard, 1922 is synonymous with Trachelius ovum (Ehrenberg, 1831) Ehrenberg, 1833" in "Monograph of the Dileptids (Protista, Ciliophora, Rhynchostomatia)
Peter Vďačný & Wilhelm Foissner" Pag.86
Regards
carlos

[Protos]

Hello Carlos,

Thank you for giving this precision. I indeed read his proposal to fuse both species.
If you have the opportunity to read the "études sur les infusoires d'eau douce" by E. Penard (1922) he has several pages to differentiate both species. Dragesco has also his opinion on the subject.
That said Foissner is, of course, the reference for now.
Thanx again

[carlos.uruguay]

Thanks to you Protos!
I think that may be Trachelius subtilis.
I've been talking with Bruce and missing many data to identify it as Apotrachelius
Unfortunately I have not found another specimen to be able to observe it more
carlos