  The three dimensional Total Routhian Surface (TRS) calculations are carried
out for 64 nuclei between $70\leq A\leq 90$ to find triaxial superdeformed
nuclei. Total of 12 nuclei were predicted to have triaxial superdeformation in
which the neutron rotational energy plays a key role and the neutron shell
energy plays additional role in the formation of triaxial superdeformed nuclei.
