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'''''Hatena arenicola''''' is a [[species]] of [[unicellular organism|single-celled]] [[eukaryote]]s discovered in 2006.<ref name="okamoto"/> The species is a [[flagellate]], and can resemble a [[plant]] at one stage of its life, in which it carries a [[photosynthesis|photosynthesizing]] [[alga]] inside itself,<ref name="sciam">{{cite web |url=http://www.scientificamerican.com/article.cfm?id=marine-microorganism-play |title=Marine Microorganism Plays Both Host and Killer|work=[[Scientific American]] |accessdate=2009-07-06 |first=Tracy |last=Staedter |date=14 October 2005}}</ref> or an [[animal]], acting as [[predator]] in another stage of its life. Researchers believe that this organism is in the process of [[endosymbiosis]], in which one organism is incorporated into another, resulting in a completely new life form
The algal endosymbiont is a [[green alga]] from the genus ''[[Nephroselmis]]''.<ref name="okamoto">{{cite journal | doi = 10.1016/j.protis.2006.05.011 | pmid = 16891155 |date=October 2006 | last1 = Okamoto | first1 = Noriko | last2 = Inouye | first2 = Isao | title = Hatena arenicola gen. et sp. nov., a katablepharid undergoing probable plastid acquisition | volume = 157 | issue = 4 | pages = 401–19 | journal = Protist}}</ref> Unlike a fully integrated organelle, the ''Nephroselmis'' alga does not divide along with the host cell. When the host cell divides, one of the daughter cells receives the ''Nephroselmis'' cell and the other daughter returns to a heterotrophic lifestyle.<ref>{{cite journal | pmc = 2593190 | doi = 10.1128/EC.00118-08 |date=Dec 2008 | author = Mittelmeier, Tm; Berthold, P; Danon, A; Lamb, Mr; Levitan, A; Rice, Me; Dieckmann, Cl | title = C2 Domain Protein MIN1 Promotes Eyespot Organization in Chlamydomonas reinhardtii | volume = 7 | issue = 12 | pages = 2100–12 | issn = 1535-9778 | pmid = 18849467 | journal = [[Eukaryotic Cell]] | url = http://ec.asm.org/cgi/pmidlookup?view=long&pmid=18849467 | format = Free full text}}</ref> The latter behaves like a predator until it ingests a green alga. The alga then loses its flagella and cytoskeleton, while the ''Hatena'', now a host, switches to photosynthetic nutrition, gains the ability to move towards light and loses its feeding apparatus.
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