[coccoliths] Unidentified calcareous nannofossil

[Andre Gatto]

Dear colleagues,

I hope this message finds you well.

I am writing to request your input regarding an unidentified calcareous
nannofossil that I have been consistently observing in samples assigned to
the Late Miocene (NN11). The specimens were recovered from marine sediments
(offshore Brazil, SW Atlantic), and have been analyzed under
cross-polarized light microscopy. I have attached a set of photomicrographs
illustrating multiple orientations and preservation states.

I have been considering possible affinities with *Orthorhabdus finifer*, as
well as *Orthorhabdus extensus* and *Ceratolithus vidalii*, but none
provided a satisfactory match.

I would greatly appreciate any insights, suggestions, or references that
might help clarify its taxonomic affinity.

Thank you very much for your time and expertise.

Best regards,
André Luiz Gatto Motta

[image: NN-UNKN-2026.jpg]

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