Bathycoccus prasinos  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  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.