Apparently (lower magnifications) appears to be mostly Aphanocapsa or Aphanothece except the last one- which is superficially similar to Chroococcidiopsis or even Myxosarcina sp., but the clear mucilage coat surrounding the cells is not distinct.

Thank you so much Abhishek Mukherjee .... So you are saying that first four resmble to Aphanocapsa or Aphanothece....Can you please clarify one by one. That would be a huge help. And magnification is 40X.

The first appears more likely as Aphanothece due to the chloroplast nature. The third picture that looked like Aphanocapsa, upon closer inspection looks similar to Chroococcus, especially due to the cellular orientations from a superficial stand point.

Thanks you so very much Sir Abhishek Mukherjee

look this http://cfb.unh.edu/phycokey/Choices/Cyanobacteria/cyano_colonies/APHANOCAPSA/Aphanocapsa_key.html

and this http://cfb.unh.edu/phycokey/Choices/Cyanobacteria/cyano_colonies/PLEUROCAPSA/Pleurocapsa_Image_page.htm

Lorenzo Portillo Cogollo Thank you so much Sir

Aqsa Khalil

👍

Aqsa Khalil

If it is possible then opt for sequencing studies to clearly identify the species. Morphological identifications based on captured images are not optimum tools for taxonomic identification. Otherwise even the morphometric analyses performed by yourself directly by scoping into the eyepiece of the microscope reveals so many finer details that captured images fail to deliver. Self performed morphometry is always more accurate than any consultations based on captured images, barring only the cases where the resolution and magnification combine to deliver stupendous picture quality.

Abhishek Mukherjee Thank you so much Sir. Sure Sir, I will again revisit the cultures and try to note maximum details under microscope.

I seriously doubt that they all are cyanobacteria. The first two pictures show cells with a certain content, which looks more like chlorophytes than cyanophytes. Also, the way the cells are pressed against each other does not match Aphanothece or Aphanocapsa. Picture four is out of focus and so is the fifth picture, but it looks more like a chlorophyte than a cyanophyte.

These photographs are not cyanobacteria. They display the characteristics of a eukaryotic cell with a well defined nucleus and chloroplasts. With that said, they look very much like the green alga Tetraspora.

http://www.algaebase.org/search/genus/detail/?genus_id=43486

George A. Zoto Thank you so much sir

Follow the user manual of Fritch 1935, Desikacharya 1959, Algal web server 2019.

i agree with the people who think, that the firts two photograhs are not cianobacteria, they look like more like a Xantophyceae or Tetrasporales.

only b12singlepaperscaled looks like a cyano like Cyanosarcina. aqsaB13FBscaled can be an early stage from Cyanosarcina also.

Thank you so much Maria Verdugo Althöfer

The photographs 2,3 and 4 with the arrangement of cells looks more like Tetraspora sp.