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.
Hansmann, E. W. (1973). diatoms of the Streams of Eastern Connecticut. State Library, Hartford. pp. 50, 52 [fig.18:J,K]
Achnanthidium microcephalum Kütz. 1844 (lectotype); Achnanthidium lineare W. Smith 1855 (lectotype); Achnanthes minutissima var. cryptocephala Grunow in Van Heurck 1880; Achnanthes minutissima Kützing 1833
Valve is narrowly linear-elliptical, with rostrate apices; raphid valve has narrow axial area leading to an irregularly shaped central area bordered by short striae, and radiate striae throughout; pseudoraphe valve has a narrow pseudoraphe with no central area, radiate striae throughout; both valves have striae that are difficult to distinguish; length is 5-40µm, breadth is 2-4µm; striae count is ~30 in 10µm at the centre becoming 36-38 in 10µm at the ends