  The classical spectral curve for the worldsheet theory of the AdS_5 x S^5
lambda superstring is constructed. The lambda string is interpreted as a
regularized, non-abelian T dual of the AdS_5 x S^5 superstring with respect to
full PSU(2,2|4) symmetry. The form of the curve is identified as the
semi-classical limit of a set of Bethe ansatz equations for an XXZ type spin
chain for the supergroup PSU(2,2|4) in contrast to the string in AdS_5 x S^5
which is XXX type.
