Hidden Supersymmetries of Deformed Supersymmetric Mechanics

We consider quantum models corresponding to superymmetrizations of the two-dimensional harmonic oscillator based on worldline $d=1$ realizations of the supergroup SU$(\mathcal{N}\mathrm{/}2\mathrm{\mid }1)$, where the number of supersymmetries $\mathcal{N}$ is arbitrary even number. Constructed models possess the hidden supersymmetry SU$(\mathcal{N}\mathrm{/}2\mathrm{\mid }2)$. Degeneracies of energy levels are spanned by representations of the hidden supersymmetry group.