However, the Amphioxus is important not merely because it fills the
deep gulf between the Invertebrates and Vertebrates, but also
because it shows us to-day the typical vertebrate in all its
simplicity. We owe to it the most important data that we proceed on
in reconstructing the gradual historical development of the whole
stem. All the Craniota descend from a common stem-form, and this
was substantially identical in structure with the Amphioxus.
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