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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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Map of south Florida Loxahatchee (LOX) WCA 2A WCA 3A Biscayne Bay Shark River Slough (SRS) Taylor Slough (TS) Florida Bay Everglades National Park (ENP) Everglades National Park (ENP)

Fragilaria ulna

Schmidt, a. (1874-1959). Atlas der Diatomaceen-Kunde: Band I-III. O. R. Reisland, Leipzig. pp. 151-153 [fig.159b]
Bacillaria ulna Nitzsch 1817; Synedra ulna (Nitzsch) Ehrenberg 1832
Frustule is linear in girdle view; valve is linear to linear-lanceolate, with spathulate to broadly rounded to capitate apices; transapical striae are clearly punctate, parallel, may be convergent at the very ends; pseudoraphe is narrowly linear; central area may be irregular, to small, to completely lacking; length is 50-350µm, breadth is 5-9µm; striae count is 8-12µm (most with ~10µm) in 10µm
  • Transect Project

  • Sample localities:
  • Water Conservation Area 2A (WCA 2A)