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 .
You can also click on one of labeled areas on the map to browse by location.
Krammer, K. (1997): "Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Teil 1. Allgemeines und Encyonema Part". Bibliotheca Diatomologica, Band 36, pg. 157-158;
Cymbella pusilla (Grunow, 1875 in Schmidt et al.),
Valve is moderately dorsi-ventral with smoothly arched dorsal and slightly convex or approximately straight ventral margin, and bluntly attenuate or (occasionally) subtilely constricted and ventrally produced extremities; narrow axial area is essentially straight, broadening gradually into the valve centre to form a narrow, lanceolate space; central area is indistinct; raphe is filiform, with somewhat enlarged and dorsally deflected proximal ends, and dorsally recurved distal ends (recurve follows a sub-terminal ventral deflection); solid or indistinctly lineate striae are radiate, becoming parallel to slightly convergent towards the ends, with one to several distinctly shortened central striae; length is 14-40µm, breadth is 3.5-8µm; striae count is ~16 in 10µm, becoming 20 in 10µm towards the ends; 25 Krammer (1997) notes that the valve and raphe structure of this taxon are identical with many taxa in the genus Navicula sensu stricto (Navicula lineolatae), especially the alveoli, areolae and raphe (no species in the other cymbelloid genera bear a similar structure); it is also unique due to the habitat it prefers