  We consider quantum supergroups that arise in non-anticommutative
deformations of N=(1/2,1/2) and N=(1,1) four-dimensional Euclidean
supersymmetric theories. Twist operators in the corresponding deformed algebras
of superfields contain left spinor generators. We show that non-anticommutative
$\star$-products of superfields transform covariantly in the deformed
supersymmetries. This covariance guarantees the invariance of deformed
superfield actions of models involving $\star$-products of superfields.
