Palaeolyngbya (meaning "primitive Lyngbya" or "before Lyngbya") is a cyanobacteria from the Proterozoic.

Its cells are roughly 10 microns wide.

Fossils have been recorded from the Bitter Springs Group,[5][3] Kushalgarh Formation,[1] Rhynie Chert[2] and Gaoyuzhuang Formation.

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