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.
Witkowski et al. (2000):"Iconographia Diatomologica (Vol.VII). Diatom flora of marine coast I", pg.411, Pl.214:3,4
Rhopalodia gibberula var. protracta sensu Fricke in A. Schmidt Atlas
Valve is strongly dorsi-ventral, lunate with convex dorsal margin and concave to almost straight, narrowed towards rostrate obtusely to acutely rounded apices; raphe keel is weakly developed and marginal, with very coarse fibulae on ventral margin (40-70 in 10µ); distinctly punctae transapical striae (18-27 punctae in 10µm); length is 14-78µm, breadth is 5-12µm; striae count is 15-18 in 10µm