This taxon has a linear valve with slightly concave sides. The ends are rounded and the axial area is of different thickness than the siliceous thickening of the raphe. The central area is distinctand elliptical. There are clear terminal areas in extension to the sides of the valve. The striae are radiate and are somewhat curved throughout the valve (Patrick and Reimer 1966).
Synonyms
Navicula bacillum Ehr., Phys. Abh. Akad. Wiss. Berlin, for 1838:130. 1840 (Patrick and Reimer 1966).
Navicula pseudobacillum Grun. in Cl. & Grun., K. Svenska Vet.-Akad. Handl., Ny Foljd, 17(2):45, pl. 2, fig. 52. 1880 (Patrick and Reimer 1966).
Navicula bastianii Perag. in Temp. & Perag., Diat. Monde Entier, 2nd ed., p. 183. 1909 (Patrick and Reimer 1966).
Ecology
This taxon prefers fresh to slightly brackish water and is an alkaliphil. It is circumneutral pH (Patrick and Reimer 1966).
Length is 30 to 89 micrometers (Patrick and Reimer 1966).
Width is 10 to 20 micrometers (Patrick and Reimer 1966).
Striae are 12 to 14 in 10 micrometers (Patrick and Reimer 1966).
This image was taken using DIC.