Oswaldella billardi Briggs, 1938: 40, fig. 3, pl. 15 fig. 1; Naumov & Stepanjants, 1962: 98 –99; 1972: 53–54, fig. 14 c; Stepanjants, 1972: 74; Peña Cantero & Vervoort, 1997: 269–273, fig. 1; 1998: 36; 2004: 818–820, fig. 2; Peña Cantero & García Carrascosa, 1999: 214; Peña Cantero & Marques, 1999: 85.
Oswaldella billardi billardi Stepanjants, 1979: 113, pl. 21 fig. 3 a, b.
Not Oswaldella billardi — Blanco, 1984: 45–46, pl. 41 fig. 95, pl. 42 figs 96–97 (= Oswaldella shetlandica Stepanjants, 1979 p.p.; Oswaldella erratum Peña Cantero & Vervoort, 1997 p.p.); Blanco & De Redolatti, 1977: 1–8, pls 1–4 (= Oswaldella shetlandica Stepanjants, 1979); Broch, 1948: 13–16, fig. 4 b; Peña Cantero et al., 1997: 349–353, figs 2, 13 b (= Oswaldella erratum Peña Cantero & Vervoort, 1997).
Not Oswaldella billardi shetlandica Stepanjants, 1979 (= Oswaldella shetlandica Stepanjants, 1979 p.p.; Oswaldella erratum Peña Cantero & Vervoort, 1997 p.p.).
Ecology. Shelf species (Peña Cantero & Vervoort 1997), found at depths from 7 (Stepanjants 1972) to 412 m (Peña Cantero & Vervoort 2004), on bottoms of small rocks with red algae (Briggs 1938), sand and boulders (Naumov & Stepanjants 1972) and rocks, pebbles, sand and mud (Stepanjants 1979). Gonothecae: January (Briggs 1938; Stepanjants 1979), November (Stepanjants 1979) and December (Peña Cantero & Vervoort 2004, immature).
Distribution. Circum-Antarctic (Peña Cantero & Vervoort 2004). East Antarctica: Davis Sea (Briggs 1938; Stepanjants 1972), off Queen Mary Coast and Enderby Land (Naumov & Stepanjants 1962), off Adélie Coast (Naumov & Stepanjants 1972) and north of Wilkes Station, Budd Coast, Wilkes Land (Peña Cantero & Vervoort 2004). West Antarctica: off McDonald Ice Rumples, east coast of the Weddell Sea (Peña Cantero & Vervoort 2004).