alexa The phylogenetic position of enteromonads: a challenge for the present models of diplomonad evolution.
Agri and Aquaculture

Agri and Aquaculture

Journal of Aquaculture Research & Development

Author(s): Kolisko M, Cepicka I, Hampl V, Kulda J, Flegr J

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Abstract Unikaryotic enteromonads and diplokaryotic diplomonads have been regarded as closely related protozoan groups. It has been proposed that diplomonads originated within enteromonads in a single event of karyomastigont duplication. This paper presents the first study to address these questions using molecular phylogenetics. The sequences of the small-subunit rRNA genes for three isolates of enteromonads were determined and a tree constructed with available diplomonad, retortamonad and Carpediemonas sequences. The diplomonad sequences formed two main groups, with the genus Giardia on one side and the genera Spironucleus, Hexamita and Trepomonas on the other. The three enteromonad sequences formed a clade robustly situated within the diplomonads, a position inconsistent with the original evolutionary proposal. The topology of the tree indicates either that the diplokaryotic cell of diplomonads arose several times independently, or that the monokaryotic cell of enteromonads originated by secondary reduction from the diplokaryotic state. This article was published in Int J Syst Evol Microbiol and referenced in Journal of Aquaculture Research & Development

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