Dr.Ankita Mitra, unfortunately i don't have it. Thank you for your answer
Dr.Abhijit Mitra yes it's from coastal water. Thanks for your answer.
I agree that Synedra is a likely ID but you may also want to consider Pinnularia. They are both pennate diatoms with a raphe and similar morphology. There are some slight differences in the shape particularly in the terminal morphology. When you encounter this taxa again carefully read the descriptions to tease out which genus you in fact have. A very good guide book to use is
Identifying Marine Phytoplankton Editor: Carmelo Tomas https://doi.org/10.1016/B978-0-12-693018-4.X5000-9
The debate regarding Synedra, Ulnaria, and Fragilaria is ugly and ongoing. The current consensus is that Synedra is marine while the other two are freshwater (https://diatoms.org/genera/synedra/guide). I cannot say with absolute certainty that this is synedra, though that is likely. Unfortunately, I do not believe this specimen can be identified to the species level simply because the key features are not visible in this image. It is almost certainly not Pinnularia though, (also, Synedra is araphid) since Pinnularia is a freshwater genus commonly found in waters with low conductivity with most species that long being much wider. Just an FYI, nobody knows araphids better than Eduardo Antonio Morales.
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