Jakoba  Jakoba is a genus in the taxon Excavata and currently has only a single described species, "Jakoba libera". (Previously described "Jakoba incarcerata" has been renamed "Andalucia incarcerata", and "Jakoba bahamensis" /"Jakoba bahamiensis" is not formally described.)  "Jakoba" are small bacterivorous zooflagellates (jakobids) found in marine  and hypersaline environments. They are free swimming trophic cells with two flagella and range between five and ten micrometers in length. Cells rotate along their longitudinal axis to allow for swimming in straight lines unless deformation and “squirming” occurs due to compression in debris. During feeding, bacteria are removed from the water column by a current created by the posterior flagellum. This current causes the bacteria to collect in the groove  on the right ventral side of the cell – aiding in ingestion and the creation of food vacuoles. Cellular components for "Jakoba" are not particularly unique. They contain a single nucleus found close to the flagellar bases, a single Golgi body, and the mitochondrial organelles are flattened. "Jakoba" mitochondria, however, are of particular interest evolutionarily due to their unique bacterial-like mitochondrial genomes. It has been found that their mitochondrial genomes contain considerably more functional genes than those of other eukaryotic groups and it appears they have retained the ancestral eubacterial RNA polymerase, which has been replaced by viral type polymerase in all other mitochondriate eukaryotes. Overall, jakobid mitochondrial genomes are primitively complex in that they resemble their proteobacterial ancestors more than any other mitochondria. "Jakoba" use asexual reproduction by binary fission. The sexual reproduction or the formation of cysts have not been observed. “The circular mitochondrial genome of "Jakoba libera" strain ATCC 50422 is 96.6 kbp in size. Sequencing is nearly completed. At present, 77 genes have been identified, none of them including an intron. Intergenic regions account for ~ 30% of the genome and contain clusters of tandem repeats whose unit length is ~20 bp. Transcribed genes are found on both DNA strands. The standard genetic code is used for translation. Encoded genes include those commonly found in mtDNA, including the protein-coding genes nad1,2,3,4,4L,5,6, cob, cox1,2,3, and atp6,8,9, as well as large subunit (rnl) and small subunit (rns) rRNA genes and >22 tRNA genes.