  Let $p \geq 3$ be a prime integer and, for $l \geq 1$, let $G \cong {\mathbb
Z}_{p}^{l}$ be a group of conformal automorphisms of some closed Riemann
surface $S$ of genus $g \geq 2$. By the Riemann-Hurwitz formula, either $p \leq
g+1$ or $p=2g+1$. If $l=1$ and $p=2g+1$, then $S/G$ is the sphere with exactly
three cone points and, if moreover $p \geq 7$, then $G$ is the unique $p$-Sylow
subgroup of ${\rm Aut}(S)$. If $l=1$ and $p=g+1$, then $S/G$ is the sphere with
exactly four cone points and, if moreover $p \geq 13$, then $G$ is again the
unique $p$-Sylow subgroup. The above unique facts permited many authors to
obtain algebraic models and the corresponding groups ${\rm Aut}(S)$ in these
situations. Now, let us assume $l \geq 2$. If $p \geq 5$, then either (i)
$p^{l} \leq g-1$ or (ii) $S/G$ has genus zero, $p^{l-1}(p-3) \leq 2(g-1)$ and
$2 \leq l \leq r-1$, where $r \geq 3$ is the number of cone points of $S/G$.
Let us assume we are in case (ii). If $r=3$, then $l=2$ and $S$ happens to be
the classical Fermat curve of degree $p$, whose group of automorphisms is well
known. The next case, $r=4$, is studied in this paper. We provide an algebraic
curve representation for $S$, a description of its group of conformal
automorphisms, a discussion of its field of moduli and an isogenous
decomposition of its jacobian variety.
