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> The discovery of Protoavis seems to indicate that Archaeopteryx is
> not the ancestor of all modern birds.
Only if it is really a bird, *and* no theropod group is derived
from avian morphology ancestors (as Olshevsky suggests).
> Is Archaeopteryx on a separate line which has extincted?
Maybe. Maybe not. All the evidence is not yet in.
[Actually, even as an "ancestral" bird, it is extremely unlikely
that it is actually the common ancestor of all later birds].
> Is still possible that Dinosaurs are on the line which goes to
> Protoavis and then to the birds?
The peace of God be with you.