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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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View a list of all species

You can also click on one of labeled areas on the map to browse by location.
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)

Biremis circumtexta

(Meister ex Hustedt) Lange-Bertalot & Witkowski
Witkowski et al. (2000):"Iconographia Diatomologica (Vol.VII). Diatom flora of marine coast I", pg.158, 159 Pl.154:1-8;
Navicula circumtexta (Meister ex Hustedt, 1934)
Ecological Preference:
Valves lanceolate with acutely rounded apices 25-40µm long, 6-9.2µm broad, raphe straight, external central endings approximate, deflected in one side, axial area assymetrical, at one side narrowly linear, limided by a row of single punta, central area small, transversely rectangular. Transapical striaedeveloped in the marginal zone, in the middle parallel, towards apices becoming radiate, 16-18 in 10µm.
  • Southeast Florida Coastal Mangroves
  • Florida Bay Paleo Project

  • Sample localities:
  • Florida Bay