Frankovich, T.,
Sullivan, M.
(2022).
Seminavis.
In Diatoms of North America.
Retrieved May 01, 2026, from https://diatoms.org/genera/seminavis?x-craft-preview=409442409a997390693ff24c7010fd6f1c96fb56f8f091fa016a63de9a54aaccecpiqubknd
Asymmetric Biraphid
Seminavis
Valves strongly dorsiventral
Raphe displaced laterally
Lineolae present
Girdle bands hyaline
Valves are semi-lanceolate with a curved dorsal margin and a more or less straight ventral margin. The dorsal mantle is well developed, whereas the ventral mantle development is minimal. Areolae are lineolate, slit-like, and apically elongated, that is, they are lineolae. Internal hymenes are present. The dorsal and ventral striae are...