Discussion of Phylogenetic Relationships
The relationship of Preaxostyla to other eukaryotes remains less certain. They were proposed to be members of the Excavata based on the typical excavate structure of the cytoskeleton of Trimastix (O’Kelly et al., 1999; Simpson et al., 2000), remnants of which were subsequently identified in the oxymonad Monoceromonoides (Simpson and Patterson, 2001; Simpson et al., 2002), Recent multi-gene molecular phylogenies have supported the monophyly of most, and probably all, Excavata, including Preaxostya (Hampl et al., 2009). The weight of molecular phylogenetic evidence suggests that Preaxostyla is most closely related to parabasalids and Fornicata, the other major groups of Excavata that lack classical mitochondria (Cavalier-Smith, 2003; Simpson et al., 2008; Hampl et al., 2009), however a closer relationship with Malawimonas remains plausible (see Simpson et al., 2006).
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