Dear Ridhi,

Here are my suggestions for your pictures.

1. The first one could be a species of Nephrocytium perhaps N.limneticum

2. Second one is a Symmetrical biraphid  diatom Cosmioneis

3. could be a centric diatom

4. a colony of diatoms or a filamentous blue green alga like 

5. could be a species of  Araphid diatom  Fragiliaria

6.-could be the  hormogonium of a blue green alga like Cylindrospermum and

7 a .filament of the same.

8.  Asymmetrical biraphid diatom Entomoneis (Basiyonim:  Amphiprora )

9.could be a species of Microspora

10. could be a species of  Fragiliaria

Good luck!

Hi,

Here are some more identifications suggestions to consider:  

1. If there is no mucilage around the cells (hard to tell in the picture), than instead of Nephrocytium it could be a Scenedesmus sp. 

3. It could be Stephanodiscus (a centric diatom), but it doesn't look ornamented enough to be an algae

4. Cyanobacteria- Anabaena 

5. Diatom- Fragilaria brevistriata (Pseudostaurosira brevistriata). Acolony in girdle view

7. Maybe Microspora

9. Diatom- Aulacoseira. If you can still look at the samples under the microscope, look at the cell walls (e.g. are they straight, rigid) and how they cells connect. 

10. Diatom- Nitzschia sp.

Best

Hello Ridhi,

Possible identifications for you, starting from the top:

1. Nephrocytium sp.

4. Cylindrospermum sp.

5. Empty Fragillaria sp. frustules  

6. Dolichospermum sp. - possibly D.planctonicum or D. smithii

7. Ulothrix sp. ?

8. Entomoneis sp.

9. Microspora sp.?

Cheers

Adam

Dear Ridi,

First of all try to significantly improve the quality of your micro photos! Try to achieve the maximum magnification for the native slides, while for the diatoms use the specific method of cleaning and preparing of permanent slides which can be observed in high magnification! Only than you (or anybody else) can be more precise in the proper identification of the species. 

I agree with Dr Svestislav.

The diatoms in your picture (2, 3, 5, 8 and 10) are all empty/dead. Numbers 1 and 9 are Chlorophyta, 4 and 6 are Cyanobacteria. I do not recognize 7.

 I agree with Jackson Achankunju's answer except for 6 and 7. I think its Johannesbaptistia sp ( maybe J. pellucida). Some of these aren't clear to identify.

hello i agree with mr. jackson..

Dear , Saluja 

The Photo(2) belonging to genus Mastogloia sp

(3) Coscinodiscus sp

(4) Melosirs sp

(8) Entomoneis sp

(9)Leptocylindrus sp

and I will contentious to confirm classification of other image  

PLEASE SEND YOUR SAMPLES TO NICM, PUNE  INDIA FOR PROPER IDENTIFICATION.

hello Ridhi it is too difficult to identify these algae within you images you need more clear & accurate ones and you should have both lateral and valve view for each diatoms 

I Wonder if there is any Atlas for such marine algae 

It would be easy to identify them.

Regards

good greeting

I think the second picture is either Cymbella or species Caloneis amphisbaena and picture number 9 I think it is close to Ulothrix

  The last picture is Synedra

With my wishes