The presumed blood vessel was a dorsal nerve cord, a feature associated with the animal group known as chordates, in the phylum Chordata. All chordates, such as vertebrates, eel-like lancelets ...

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 ...

Tunicates, also known as sea squirts, are fascinating marine organisms that belong to the phylum Chordata. They exhibit unique biological features, including a complex life cycle that involves ...