However, the origin of eukaryotes can be traced back to stages prior to the formation of LECA. The current scientific consensus agrees that eukaryotic organisms originated from within the Archaea, in particular, from clades close to TACK archaea (Thaumarchaeota, Aigarchaeota, Crenarchaeota and Korarchaeota).[3] As such, if Eukarya descend from Archaea, this last group becomes paraphyletic and offers the possible identification of FECA (First Eukaryotic Common Ancestor),i.e. the oldest branching point at which the eukaryote lineage and its closest extant relatives separated. Therefore, the evolutionary process that led to the origin of the crown-group eukaryotes (eukaryogenesis) would consist in the transition from FECA to LECA via the acquisition of the eukaryotic traits.