Protistan schematic phylogeny representing current view about eukaryotes phylogeny grouping all known eukaryotic life to six major clades or supergroups , together with information about the mitochondria from some anaerobic, facultatively anaerobic or parasitic representatives [19, 21]. With greater sampling of anoxic habitats [3, 4, 27], additional information about anaerobic eukaryotes can be expected. The latest additions are the new species of loriciferan animals (red) from the anoxic L'Atalante basin . LECA: last eukaryotic common ancestor. Note the absence of primitively amitochondriate lineages among eukaryotes [19, 21].