Jakobid
[8] Jakobids have two flagella, inserted in the anterior end of the cell, and, like other members of order Excavata, have a ventral feeding groove and associated cytoskeleton support.[9] The posterior flagella has a dorsal vane and is aligned within the ventral groove, where it generates a current that the cell uses for food intake.[6] The sessile, loricate Histionidae and occasionally free-swimming Jakoba libera (Jakobidae) have extrusomes under the dorsal membrane that are theorized to be defensive structures.[4][6] Their primary prey is generally considered to be bacteria, though one species has been observed eating extremely small (< 1 μm) eukaryotic cells.[6] Another hypothesis is that the phage-type RNA polymerase moved from one eukaryote group to another via lateral gene transfer, replacing the bacteria-type enzyme, and simply did not reach the Jakobids.[6] However, the gene arrangement of Jakobid mitochondrial DNA suggests an ancestral origin of bacteria-type RNA polymerase over a more-recent divergence.
Jakoba liberaStygiella incarcerataReclinomonas americanaHistiona aroidesScientific classificationEukaryotaDiphodaDiscobaAndaluciidaeJakobidaeHistionidaeStygiellidaeSynonymsheterotrophicflagellareukaryotesExcavatamonophyleticmitochondrial genomesHeteroloboseaEuglenozoacytoskeletonnucleusnucleolusmitochondrioncristaevacuolesendoplasmic reticulumsessileloricateextrusomesenvironmental DNAmitochondrial DNARNA polymeraselateral gene transferAndaluciaStygiellaJakobaReclinomonasHistionaJakobeaJakobidaAndalucinaS. incarcerataAndalucia incarcerataR. americanaLoukozoaProc. Natl. Acad. Sci. U.S.A.BibcodeEukaryoteDomainDiaphoretickesAmorpheaAmoebozoaDiscoseaTubulineaEumycetozoaVarioseaArchamoebeaCutoseaObazoaApusomonadidaBreviateaOpisthokontaHolomycotaRotosphaeridaHolozoaTunicaraptorBicellumIchthyosporeaPluriformeaFilozoaFilastereaChoanozoaChoanoflagellataAnimaliaProvoraHaptistaCentroplasthelidaHaptophytaTelonemiaRhizariaCercozoaEndomyxaForaminiferaRadiolariaAlveolataColponemidaCiliophoraMyzozoaApicomplexaChrompodellidaDinoflagellataPerkinsozoaStramenopilesPlatysulcusBigyraBicosoecidaPlacidozoaSagenistaGyristaDevelopeaPirsonialesHyphochytriomycetesOchrophytaOomycetesActinophryidaPancryptistaMicroheliellaCryptistaPalpitomonasCryptophytaArchaeplastidaGlaucophytaPicozoaRhodelphidiaRhodophytaViridiplantaePrasinodermophytaChlorophytaStreptophytaChlorokybusMesostigmaKlebsormidiophyceaeCharophyceaeColeochaetophyceae