Abstract
The identification of the first organisms is currently not solved. However, it is agreed that the bacterial cells (Prokaryota or Monera) were the pioneering unicellular organisms. These cells were the progenitors of the nucleated compartmentalized eukaryotic cells. The evolutionary Eukaryogenesis has occurred (as many speculate), once or in several events via, endosymbiosis. This theory may be substantial at least for the origin of plastids and mitochondria. While the (other possibility) autogenous (or Direct Filiation) hypothesis could also have taken place in this eukaryosis process. Actually, there are a few proposals pertaining to the origin of the first nucleated organisms. Origin of organisms deduced from the 5 s rRNA sequence points out the red algae as the first eukaryotic division. Other molecular analyses suggest that the red algae diverged very near to the divergence of the “crown taxa” (fungi, plants and animals).
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