Manguin (1960: 320, pl. 16, fig. 188)
Cells large, solitary, twisted about the valvar axis, compressed and usually lying in girdle view (where rectangular in shape); apical axis 52–79 µm; transapical axis c. 10 µm. Valves elliptical to lanceolate; apices rounded, with a prominent wing-like keel supporting the raphe (Fig. d). Valve striae 17–22 in 10 µm (valve) and 20–24 in 10 µm (keel) (Manguin, 1960). Copulae numerous, open, porous. Chloroplast single, plate-like and bi-lobed, or 2 per cell.
Prydz Bay, East Antarctica; Lützow-Holm Bay (Tanimura et al., 1990); Weddell-Scotia Confluence (Garrison et al., 1987).
Material collected for the current study has 17-22 striae in 10 µm (valve) and 22-24 striae in 10 µm (keel), with typically the same number of valve and keel striae on any given valve face. This varies slightly from the 20 striae in 10 µm (valve and keel) originally described by Manguin (1960).
Although Reimer & Patrick (1975) suggested that Amphiprora kufferathii should be transferred to Entomoneis, no formal combination has been made.