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Whoops, We’ve Been Looking at a Really Important Fossil Upside Down This Whole Time
But that notochord was enough to hail this half-a-billion-year-old fossil a the beginning of the phylum Chordata. That’s why it came as quite a surprise when researchers from the University of ...
The Scientist2y
This Simple Fish May Have Been One of the First Vertebrates
He points out that the fossils seem to be missing a notochord—a rod typically found behind the neural tube in chordates, which provides structural support and assists in the patterning of cells into ...