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Looking at most chordate phylogenetic trees, it seems that we usually have something like this:

  ,================= Lancelets    
 =| ,=============== Tunicates
  \_|
    \_______________ Craniates

So, my question is, what do we think the common ancestor of tunicates and craniates looked like? Did both clades evolve from a lancelet-like ancestor, with the tunicates becoming sessile after the divergence, or are craniates descended from a tunicate-like ancestor?

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