2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/221178In [arXiv:0808.1677] 3 dimensional field theories are proposed to on-shell represent N=8 SUSY algebra and SO(7) or SO(4)xSO(4) subgroups of full SO(8) automorphism. They are theories of 8 scalar and 8 spinor matrix fields with Yukawa, quartic and sextic self-interactions. This note is devoted to superfield and off-shell formulation of the theory. Scalar superfields are proposed to represent scalar supermultiplets. A renormalizable action with quadratic and quartic self-interactions is proposed to govern their dynamics.RevTeX 4, 4 pages; v3: typo corrected, references added; v4: Comments and references added, corrections implemented;High Energy Physics - Theorytext