  The construction of the ghost number zero and one vertex operators for the
11D pure spinor superparticle will be revisited. In this sense, an alternative
way of defining the ghost number one vertex operator will be given after
introducing a ghost number -2 operator made out of physical operators defined
on the 11D non-minimal pure spinor superspace. This procedure will make
explicit and transparent the relation between the ghost number three and one
vertex operators. In addition, using a non-Lorentz covariant b-ghost, ghost
number zero and two vertex operators satisfying standard descent equations will
be presented in full form.
