What is the oldest eukaryotic fossil that can be clearly linked to a living group of eukaryotes?

Name: What is the oldest eukaryotic fossil that can be clearly linked to a living group of eukaryotes?
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The oldest fossil of red algae is about 1.6 billion years old and shares many morphological and molecular characteristics with modern red algae. This indicates that red algae have a long evolutionary history and have remained relatively unchanged over time.

What Is the Oldest Eukaryotic Fossil That Can Be Clearly