Welcome to the Diatom Image Database! The Periphyton Group at Florida International University created and maintains the Diatom Image Database, which includes over 980 diatom taxa found in the greater Everglades region of south Florida. Please send questions or comments about the Diatom Image Database to Franco Tobias .
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Frustulia rhomboides var. crassinervia
Krammer K. & Lange-Bertalot H. (1997): "Susswaserflora von Mitteleuropa", Vol.1, fig.6,7, p.258,259
Navicula crassinervia (Brebisson ex W. Shmith 1853), Vanheurckia rhomboides var. crassinervia ((Brebisson) Van Heurck 1885)
Valve is lanceolate to elliptical-lanceolate with attenuated, rostrate apices and slightly undulate margins; axial area is narrow, with unexpanded central area; striae are very fine, with longitudinal striae appearing to be a little finer than transverse striae; length is 30-50µm, breadth is 10-15µm; striae count is 36-40 (transverse) and about 40 (longitudinal) in 10µm