Paulinella

Taxobox
name = "Paulinella"
domain = Eukaryota
unranked_phylum = Rhizaria
phylum = Cercozoa
subphylum = Monadofilosa
classis = Imbricatea
familia = Paulinellidae
genus = "Paulinella"
subdivision_ranks = Species
subdivision = "P. bulloides"cite web | url = http://itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=44014 | title = Paulinella | work = Integrated Taxonomic Information System | accessdate = 2008-01-28 ] "P. chromatophora"cite journal | journal = BMC Evol Biol. | date = 2007 | volume = 7 | issue = 85 | doi = 10.1186/1471-2148-7-85 | title = The ancestor of the Paulinella chromatophore obtained a carboxysomal operon by horizontal gene transfer from a Nitrococcus-like γ-proteobacterium | author = Birger Marin, Eva CM Nowack, Gernot Glöckner, and Michael Melkonian | url = http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=1904183 | pages = 85]
"P. osloensis" "P. ovalis"cite web | url = http://www.catalogueoflife.org/show_species_details.php?record_id=38678 | accessdate = 2008-01-31 | title = Paulinella ovalis]
"P. quinqueloba" "P. riveroi" "P. sphaeroides" "P. subcarinata" "P. subsphaerica" "P. trinitatensis"

"Paulinella" is a genus of about nine [cite web | url = http://www.speciesaccounts.org/Eukaryotes.htm | accessdate = 2008-01-28 | title = Eukaryotes ] species of freshwater amoeboids.

Its most famous member is the photosynthetic "P. chromatophora" which has recently (evolutionarily speaking) [cite journal | url = http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1713255 | title = Evaluating Support for the Current Classification of Eukaryotic Diversity | author = Laura Wegener Parfrey, Erika Barbero, Elyse Lasser, Micah Dunthorn, Debashish Bhattacharya, David J Patterson, and Laura A Katz | doi = 10.1371/journal.pgen.0020220 | journal = PLoS Genet. | date = 2006 December | volume = 2 | issue = 12 | pages = e220 ] taken on a cyanobacterium as an endosymbiont. This is striking because the chloroplasts of all other known photosynthetic eukaryotes derive ultimately from a single cyanobacterium endosymbiont which was taken in probably over a billion years ago in plants (and subsequently adopted into other eukaryote groups, by further endosymbiosis events). The "P. chromatophora" symbiont was related to the "Prochlorococcus" and "Synechococcus" cyanobacteria (sister to the group consisting of the living members of those two genera). Other than the symbiont, "P. chromatophora" is closely related to the heterotrophic "P. ovalis". [cite journal | title = Diversity and evolutionary history of plastids and their hosts | author = Patrick J. Keeling | url = http://www.amjbot.org/cgi/content/full/91/10/1481 | journal = American Journal of Botany | year = 2004 | volume = 91 | pages = 1481–1493 | doi = 10.3732/ajb.91.10.1481]

References