Taxon;Outline;"Valve ends";"Valve length, μm";"Valve width, μm";"Striae in 10 μm";"Areolae in 10 μm";References "N. sparsilineolata sp. nov.";lanceolate;"acutely rounded, non protracted";33.9–56.5;7.7–9.1;9.3–10.5;17.5–19.7;"This study" "N. pseudolanceolata";"lanceolate to rhombic-lanceolate";"gradually narrowed";28.7–50.0;7.0–9.8;9.5–11.2;22.0–25.7;"Lange-Bertalot 2001; Chudaev and Gololobova 2016" "N. oppugnata";"lanceolate to linear-lanceolate";"usually obtusely rounded";30–60;8.5–12.0;7–12;"ca. 24";"Lange-Bertalot 2001" "N. johncarteri";lanceolate;"gradually narrowing to a wedge, neither distinctly acutely nor obtusely rounded";40–75;9–12;8–10;"ca. 25";"Lange-Bertalot 2001" "N. trophicatrix";"lanceolate to rhombic-lanceolate";"gradually narrowing to a wedge, neither distinctly acutely nor obtusely rounded";25–50;7.5–10.0;11–13;21–24;"Lange-Bertalot 2001" "N. sancti-naumii";"strictly lanceolate";"more or less acutely rounded";28–48;7.0–8.5;10–11;28–30;"Levkov et al. 2007" "N. weberi";"elliptic-lanceolate to broadly lanceolate";"obtusely rounded";29–57;7.3–10.3;9–10;"ca. 24";"Bahls 2012"