The fate maps of urodeles (i.e., newts and salamanders) are
significantly different from Xenopus. One importnat difference
is that surface cells give rise to some mesoderm in urodeles (and
some anurans like Rana pipiens), whereas in Xenopus the mesoderm
is derived from the deep cells exclusively. The figure on this
page allow you to compare the fate maps for urodeles and Xenopus
(adapted from Browder et al., 1991).