Algae Eudorina with parasites? Nuclearia amoeba? Help ID

[carlos.uruguay]

Eudorina is a green colonial algae formed by many cells, multiples of 16,
united in a gelatinous mass.
Each cell has two flagella.
Those of the video measure some 26um each one.
n the video we observe inside the colony at least 3 organisms similar to amoebae.
We think that maybe are fungi or other parasitic organisms of the algae.
We appreciate any information.
We have found in in the creek Chopping, sweet watercourse of the department of San Jose, Uruguay, South America.
40X objective.
Polarized oblique light
Link:
http://www.youtube.com/watch?v=JVSbHKJD2_k
Regards
carlos

[RogelioMoreno]

Clear video.

Rogelio

[Jacek]

Nice video

[carlos.uruguay]

Thanks Rogelio and Jacek.
There is a fungus that attacks this algae, but a specialist who sent the video told me that is not that
I think this is an amoeba that attacks Eudorina. I hope Ferry clarifies it.

[jc maccagno]

Great video..loved the background sound track!

John

[carlos.uruguay]

Thank you very much John!

[carlos.uruguay]

This page shows a photo of Eudorina parasitized maybe by the amoeba Nuclearia
The image is very similar to the filmed in the video
http://protist.i.hosei.ac.jp/pdb/images ... sp_1b2.jpg
http://protist.i.hosei.ac.jp/pdb/images ... sp_3a.html
carlos

[Bruce Taylor]

Very interesting, Carlos.

[carlos.uruguay]

Thanks Bruce.
Unfortunately I didn't find another alga in the sample

[Ecki]

Very nice indeed.

This could be a Cercozoa parasite. They are amoeboflagellates and difficult to identify. If you send me your email address per PM I will send you a paper with some images and background on Ociraptor, a new species that feeds on Eudorina.

Very often these parasites are joined by Nucelaria. Nuclearia can't penetrate the cell wall, Ociraptor can. But clever Nuclearia uses the hole made by Ociraptor (or Pseudospora etc.) and feeds in the algae as well.

Regards
Ecki

[carlos.uruguay]

Thank you very much Ecki!!
I already sent to you my mail