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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)

Cocconeis placentula

Cocconeis placentula

Cocconeis placentula

Krammer K. & Lange-Bertalot H. (1991): "Susswaserflora von Mitteleuropa", Vol.4, pg.86, Taf.51:1-5;
Cocconeis placentula Ehrenberg 1838; Cocconeis punctata Ehr. 1841; Cocconeis elongata Ehr. 1841; Cocconeis pumila Kütz. 1844
Ecological Preference:
Valve is elliptical to somewhat linear-elliptical; intercalary band with rudimentary short extensions into axial cavity often in evidence; raphe valve has very narrow axial area, small (more or less oval) central area, filiform raphe (with close proximal ends and straight distal ends terminating at inner hyaline ring), radiately curved finely punctate striae (which are interrupted at the margin by a hyaline area), and short, striate submarginal area encircled by hyaline area; pseudoraphe valve has very narrow, linear pseudoraphe, faintly distinguished central area, finely punctate radiate striae (punctae form many close undulate longitudinal rows); length is 10-70µm, breadth is 8-40µm; striae count is 20-23 in 10µm (RV), 24-26 in 10µm (PRV); Krammer & Lange-Bertalot (1991) describe the araphid valve as having a linear axial area with radial punctate striae (18-22 punctae in 10µm); striae count is 20-23 in 10µm (raphid valve) and 24-26 in 10µm (araphid valve)
  • Southeast Florida Coastal Mangroves
  • Florida Bay Paleo Project
  • Transect Project

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