Perag. (Peragallo, 1921: 56, pl. 2, fig. 11)
Navicula triplex VanLand. (VanLandingham, 1975: 2857)) Navicula subpolaris auct. non De Toni (1891), sensu Hendey (1937: 345)
Cells usually solitary, linear to lanceolate, with acute apices in valve view, almost rectangular in girdle view; apical axis c. 100–105 µm; transapical axis c. 11–15 µm. Valve surface convex, with a prominent median raphe and a small hyaline central area; central and terminal raphe endings small. Transapical striae c. 6–10 in 10 µm.
Coastal waters off Davis Station, East Antarctica; Argentine Is., Antarctic Peninsula (Peragallo, 1921); Bellingshausen Sea (Hendey, 1937).
Hendey (1937) described this as “a small characteristic Antarctic diatom observed in small numbers in water obtained from melted ice”.