Bathycoccus prasinos is a picoplankton belonging to the order Mamiellales, along with Ostreococcus and Micromonas.

The cells are around 1–2 μm in length, are non-motile and are covered in scales.

The small genome (15 Mb) was recently sequenced [1] and many of the genes are related to plants, though there is significant horizontal gene transfer from other eukaryotes.

There are 19 chromosomes, two of which have a significantly different GC-content.

This green algae-related article is a stub.