I found this taxa in a reservoir. Thanks in advance
Too small for Euglena, look at the Tetrahedron on the uppermost photo
I was thinking or Chromulina or solitary cels from Botryococcus.
What do you think about this second possibility???
Dear María:
The color of the specimens coincide with chlorophyla a and c not with chlorophyl a and b.
Has your material extracellular siliceous scales?, In the posterior region of the cells seems to have siliceous scales.
Are your material fixed?
Kind regards.
Eugenia
I have never seen Botryococcus disintegrated to cells otherwise can be. Potential presence of scales might be possible.
I do agree the opinion of Judit based on the size and the morphology. It seems chrysophyte, but if you can provide more information, such as pH and temp, etc, which can help us to further analyse.
thank you for your answers.
The sample was fixed with lugol. it is an integrated sample (photic zone) from a reservoir.
secchi disk 1.29m
pH 8.11,
temperature: 23.44º C
Conductivity: 117.3µs/cm
OXigen: 8.33 mg02/L
Chla: 8.23 µg/L
Alcalinity: 43.36 mg CaCo3/L
Dear María:
Considering that the material was fixed with Lugol (I should have known considering the color of Tetrahedron in the first picture) it is posible that the cell are green, as an isolate cell of Botryococcus pertaining to the Chlorophyta. In this case there is not extracelular siliceous scales on the cells.
Good luck with the determination.
Eugenia
It would be nice to see a few more pictures of it and to see if it had a flagella at one time. I see a Cryptomonas on the left side. Some times these are infected by parasites and the look like your picture. You need to do a bit more searching.
In the sample there were Botryococcus colonies (i have put a photo) and I haven´t seen any flagella.
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