MIXED COMMUNITIES. “Processes of evolution in which entities from different lineages can be bound together in the creation of new community-level reproductive individuals are not uncommon, and such symbiotic entities occur at hierarchical levels above that of the cell, sometimes among exclusively eukaryotic partners.” A very fresh perspective on the old issue of the uniqueness of eukaryogenesis.
http://www.pnas.org/content/112/33/10278.full