Archezoa

From Freepedia

Archezoa was a kingdom proposed by Cavalier-Smith for eukaryotes that diverged before the origin of mitochondria. At various times, the metamonads, pelobionts, entamoebids, and microsporidia were included here. These groups appear near the base of eukaryotic evolution on rRNA trees. However, all these groups are now known to have developed from mitochondrial ancestors, and trees based on other genes do not support their basal placement. The kingdom Archezoa has therefore been abandoned.