New features of superdeformed bands in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Hg</mml:mi></mml:mrow><mml:mprescripts/><mml:mrow/><mml:mrow><mml:mn>194</mml:mn></mml:mrow><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>

Two new features of superdeformed (SD) bands in the A\ensuremath{\approxeq}190 region emerge from a study of $^{194}\mathrm{Hg}$ with the Gammasphere detector array. A decrease of the dynamic moment of inertia is observed for rotational frequencies \ensuremath{\Elzxh}\ensuremath{\omega}\ensuremath{\ge}0.4 MeV, confirming long standing expectations based on mean field calculations with pairing. Evidence for a small staggering in the SD transition energies is also observed, suggesting the presence of terms with fourfold symmetry in the SD Hamiltonian.

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