... Phylogenet Evol 2007, 44:255-266.50. Hackett JD, Yoon HS, Li S, Reyes-Prieto A, Rummele SE, Bhattacharya D: Phylogenomic analysis supports the monophyly of cryptophytes and haptophytes and the ... this apparent leap in complexity at the origin of eukaryotes is one of the principal challenges of evolutionary biology. e key to the origin of eukaryotes will undoubtedly be found using comparative ... currently impossible to strictly rule out the possibility that the key eukaryotic innovations evolved independently from and prior to the mito-chondrial endosymbiosis. In other words, the host...