Please provide species name for Operculodinium sp A (see pictures attached), a large size (80-90 microns) proximochorate dinoflagellate cyst with a precingular archeopyle, densely covered with fibrous processes, from Neogene sediments in North Borneo.
Dear Huibert van den Brink,
I think, the dinoflagellate: Polysphaeridium zoharyi (Rossignol 1962)Bujak et al 1980
Hungarian Age: Middle Miocene- Sarmatian; Williams et al 1993 Age: Early Eocene Ypresian-Recent.
Jiménez Moreno, G., Head M. J., Harzhauser M. 2006: Early and Middle Miocene dinoflagellate cyst stratigraphy of the Central Paratethys, Central Europe. - Journal of Micropaleontology 25: 113-139.
Yours sicerely, Mária.
Dear Maria,
I advise you to download my paper: Stratigraphic distribution of Neogene dinoflagellate cysts in a deep water well offshore Sabah, Northern Borneo.
You will see a clear difference between what I identified as P. zoharyi and Operculodinium sp A.
Kind regards, Huibert
Dear Huibert van den Brink,
Thank you, send me a paper, please, my gmail: [email protected].
Yours sincerely, Mária.
If your specimens have fibrous processes, then it will not be Operculodinium
According to Stover and Evitt (1978) Operculodinium) differs from Exochsphaeridium and Amphorosphaeridium in not having fibrous processes and in lacking differentiated apical and/ or antapical processes.
Your specimens seem to lack fibrous processes and to show more prominent cingular and apical processes. Polysphaeridium has apical not precingular archaeopyle. Before calling it Operculodinium check the processes again, they seem not to be fibrous. Then the species which is the question...........?
Obianuju P. Umeji
Thank you, Exochosphaeridium and/or Amphorosphaeridium have not been reported to occur in the Neogene (yet).
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