[Annelida] Polychaeta and Sipunculida.
(by lesha74 from rambler.ru)
Tue Aug 12 12:13:57 EST 2008
Whether you can help estimate how long ago the last common ancestor of
Polychaeta or Sipunculida lived ("crown group")?
I try construct the diagram of classis amount as function of time (diagram
of dependence N=f(t), where N - amount of Existing classis at time t).
Unfortunately I am not biologist and can not in any way find some points (in
paticular - Polychaeta and Sipunculida ).
Or may by you know who it know?
Whether you can give subjective astimation of it time?
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