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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Amphora acuta var. arcuata
Peragallo MM.H. et M. (1897 - 1908):"Diatoms of France (Atlas)", PL.XLIX, fig.27,28;
Valves semi-elliptical with slightly protracted acute ends sometimes slightly deflected ventrally. Dorsal margin convex; ventral margin straight to slightly convex. Raphe branches straight near the center deflected ventrally. Axial area narrow, linear. Central area on the dorsal side extended into narrow fascia reaching valve edge. Dorsal striae distinctly punctated, parallel at the centre, becoming slightly radiate towards the ends. Ventral striae not resolvable under LM.