Information only from this picture is not enough, but maybe: Navicula sp.

Dear Anila,

Please, do you have any other picture?

Dear Eveline. 

I do not have another picture. 

I understand both valve view and girdle view and SEM images are necessary for the identification. & I just have this photo micro graph. 

Yes it get in all seasons but u need to focus on image on microscope you get

 Dear Anila,

It is very difficult to recognize any diatom species by looking at the girdle view of the cell, such as your photograph shows. Yes, girdle bands views are used in EM but when you are absolutely sure that it belongs to a specific species you are observing in valve view. You should always look for valve view of diatoms and present also measurements of he cells. 

Best wishes

Dear Anila, you can say little more than it is a pennate diatom and I would not be so bold as to plump for Navicula from the image given. As has already been said you should identify the diatom by observation of the valve face and not the girdle bands. I can make out striae on this diatom of which there seems to be approximately 10-15 striae in 10 micrometers. The number of striae alongwith other defining characteristics of the valve face is required for taxonomic assessment.

Best wishes,

Dear Anila,

I agree with Dr.Kevin regarding the number of striae and its significance in the  identification of diatoms. My suggestion on your photomicrograph is  that  it could be a species of Pinnularia.

Best regards

Dear Anila

I am also in the same opinion that you already have!!! May be a species of Pinnularia as mentioned by Dr. Jackson.

Regards

This is fixed or live sample? 

Dear Anila ,

   It may be Pinnularia or Tabellaria spp.but one Pict. may insufficient to identify diatoms, best regards 

Pennate diatom 

Thank you all for your possibilities about the diatom. 

Dear Anila Ajayan,

It's better to identify it with valve view and check whether it is with raphe or not and then you can decide.

These view is a conectival so not its correct say abour genera, you neeed move to  valvar view

 Dear Anila;

It is a species of Pinnularia. But to identify the species you should take valve views in DIC or phase contrast and took several pictures of that species from the same sample to decide its size range which is also a criterion of diatom species identification.

You neeed move to valvar view, this view is impossíbile confirm the identity of this diatom, many look like, but it's probably an Eunotia.

Dear Anila, this is pinnate diatom. but impossible confirm in species level. because need for breath and length  measure of calibration. tell me about the dia or length. 

Yes its a pennales diatom for sure,  may be Pinnularia but it's hard to confirm from the image details.

It may be Diatoma sp.

Dear Poppy,

Always try to have proper diatom slides prior to investigation. Looking to native material is quite informative but the proper diatom taxonomy is always performed on permanent slides for LM or special preparation for EM! 

It is may be It is Pinnularia sp. You need to see valve view...

All best

It could be Pinnularia sp