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Heliotheca (Bacillariophyceae)

Heliotheca sp. from Great Bay Estuary, New Hampshire USA;  planktonic with thin silica walls and sparse pigmentation, often ghost-like.   Structure of many discoid chloroplasts appears to be disintegrating.

Helicotheca tamesis filament with three cells.  Discoid chloroplasts are located in rows radiating from the central region with the nucleus.
Photograph by © Franz Neidel. Italy, posted online

Helicotheca tamesis filament from Florida USA
Photograph from GTM Research Reserve, posted online

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