Arindam:

In order to make species identification we need well focused images at two different levels. If these are so common put them under SEM and provide scale. Also indicate if they are recovered from Palaeogene or Neogene of Indian Ocean (one can quickly determine the age by examining associated nannofossils).

Best

Syed 

 Although I have observed it, I have not identified it (as Denticulopsis). It occurrs in sediments from the Baja California coasts (uncommon), including hypersaline environments (lacunar)

Best of luck

D.

Look the publication:

Yanagisawa Y., Akiba F. 1990. Taxonomy and phylogeny of the 3 marine diatom genera, Crucidenticula, Denticulopsis and Neodenticula. Bull. Geol. Survey Japan. 41(5): 197-301.

There need cell sizes and other morphological features for identification.

Cheers,

Rinat