Invariant hypercomplex structures and algebraic curves

We show that $U(k)$-invariant hypercomplex structures on (open subsets) of regular semisimple adjoint orbits in $\mathfrak{gl}(k,{\mathbb C})$ correspond to algebraic curves $C$ of genus $(k-1)^2$, equipped with a flat projection $π:C\to{\mathbb P}^1$ of degree $k$, and an antiholomorphic involution $σ:C\to C$ covering the antipodal map on ${\mathbb P}^1$.

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