Metamonada, left: <i>Retortamonas</i>, center: <i>Hexamita</i>, right: <i>Giardia</i>. 1-single nucleous, 2-ventral feeding groove, 3-two nuclei, 4-two cytostomes, 5-two nuclei, 6-adhesive disk. Reddraw from: Jeffrey D. Silberman, Alastair G. B. Simpson, Jaroslav Kulda, Ivan Cepicka, Vladimir Hampl, Patricia J. Johnson and Andrew J. Roger, <a rel="nofollow" class="external text" href="http://mbe.oxfordjournals.org/cgi/content/full/19/5/777">Retortamonad Flagellates are Closely Related to Diplomonads—Implications for the History of Mitochondrial Function in Eukaryote Evolution</a>, Molecular Biology and Evolution 19:777-786 (2002).
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