Two new species of Paramunnidae (Crustacea, Isopoda, Asellota) from the South Shetland Islands (sub-Antarctic) are described. Austrosignum escandellae sp. nov. has long eyestalks, dorsum slightly sculpted (transverse bumps on pereonites 1–5), and lateral margins of pereonites rounded. The closest species is A. spinosum Kussakin, 1982 that also shows dorsum sculpted. The main differences are the ocular peduncle (short in A. spinosum) and the lateral margins of pereonites (pointed in A. spinosum). Coulmannia ramosae sp. nov. differs from the other two species of this genus (C. australis Hodgson, 1910 and C. frigida Hodgson, 1910) in that only the margins of pereonites 2–4 are expanded (into one point). A discussion of the Austrosignum/Munnogonium complex is provided with a comparative table of the species involved.
