To which Thalassiosira species this diatom belongs?

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Eugenia A. Sar

Dear Anton:

This diatom is not a Thalassiosira species. See the marginal ring of rimoportulae.

All the best.

Eugenia

Anton:

It looks like Actinocyclus although I don't see characters like the pseudonodule and others. More details would be needed to properly determine the taxon. Consider Hemidiscaceae in Hasle & Syvertsen in Tomas (1996) and Round et al. (1990).