  We consider the action of the D=11 supermembrane wrapping a compactified
sector of the target space in such a way that a non trivial central charge in
the SUSY algebra is induced. We show that the dynamics of the center of mass
corresponds to a superparticle in D=9 with additional fermionic terms
associated to the central charges . We perform the covariant quantization of
this system following a direct approach which introduces an equivalent action
for the system which has only first class constraints allowing to obtain the
space of physical states in a covariant way. The resulting multiplet contains
$2^8$ states corresponding to a $KKB$ ultrashort multiplet.
