Order Stephanodiscales Nikolaev and Harwood

Mediophyceae - Stephanodiscales - Thalassiosirophycidae

Parent taxon: Thalassiosirophycidae according to M. D. Guiry and G. M. Guiry 2017

Sister taxa: none

Subtaxa: Stephanodiscaceae

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Distribution:

• Quaternary of India (2 collections), North Atlantic (1), Sweden (1), United States (8: California, Oregon)

• Blancan of United States (1: California)

• Pliocene to Pleistocene of Ethiopia (2)

• Pliocene of Armenia (1), Japan (2), United States (1: Oregon)

• Miocene of United States (1: North Carolina)

• Eocene to Miocene of Argentina (1)

Total: 21 collections including 37 occurrences

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