Wikipedia
Picobiliphyte
Picobiliphytes or Picobiliphyta are a group of eukaryotic algae, discovered in 2007, which are found among the smallest members of photosynthetic picoplankton.
In some subsequent publications they were renamed "biliphytes" when sampling with greater statistical strength (than in the original publication) revealed these cells were larger than 3 µm in size. In this later research the conclusion that biliphytes were photosynthetic was also more tentative.