In a recent paper I've found SEM photos of a marine diatom (attached) which was identified as Diplomenora cocconeiformis. But one species of the genus Diplomenora (D. cocconeiformis) does not have a raphe, and shown specimen - has. So I suggest that authors mada mistake in identification, and the shown specimen should be placed in another genus.
Does somebody can determine is it Cocconeis, or can help to identify this diatom?
I haven't seen a lot of marine phytoplankton, but that does look like a Cocconeis spp., similar to the ones I have seen in freshwater lakes.
Mey be yes. It is necessary to copare its features with the genera features.
This is almost certainly Cocconeis, though I specialize in freshwater taxa, so I suppose it could be an obscure, similar, marine genus I'm unaware of. That being said, it is not Diplomenora cocconeiformis. You are correct that the presence of a raphe excludes that genus. See-
Article Morphology and taxonomy of Diplomenora gen. nov. (Bacillariophyta)
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