This is a centric species with coarse areolae and two thick processes on opposite sides of the valve. Is it a kind of Aulacoseira? or Actinocyclus? Doesn't seem to fit the definitions for either of those quite exactly. The valve is convex, about 50-60 µm in diameter. The two thick processes are difficult to see in this photo but extend several µm above the valve face. It is encountered occasionally in coastal / estuarine deposits along the northwest coast of the USA. I'd appreciate any suggestions or advice on ID. Thank you kindly.
Uh, thanks?
Doesn’t anyone recognize this thing? Coastal/estuarine species. Even information about the correct genus would be appreciated.
Eileen Hemphill-Haley
I believe it is a species of the genus Actinocyclus or Eupodiscus.
See this website:
https://diatoms.org/species/eupodiscus_radiatus
https://diatoms.org/species/actinocyclus_normanii
The ecology of each species mentioned above can help to reveal what your material is about.
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