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Twistorlike D=10 superparticle action with manifest N=8 world-line supersymmetry.

We propose a new formulation of the {ital D}=10 Brink-Schwarz superparticle which is manifestly invariant under both the target-space super-Poincare group and the world-line local {ital N}=8 superconformal group. This twistorlike construction naturally involves the sphere {ital S}{sup 8} as a coset space of the {ital D}=10 Lorentz group. The action contains only a finite set of auxiliary fields, but they appear in unusual tri-linear combinations. The origin of the on-shell {ital D}=10 fermionic {kappa} symmetry of the standard Brink-Schwarz formulation is explained. The coupling to a {ital D}=10 super-Maxwell background requires a new mechanism, in which the electric charge appears only on shell as an integration constant.