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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(Ehrenberg) Williams & Round
Krammer K. & Lange-Bertalot H. (1991): "Susswaserflora von Mitteleuropa", Vol.2/3, Fig.132:1-5,29, Fig.131:5;
Fragilaria construens (Ehrenberg)
Valves are oval, elliptical, cruciform or rarely triangular, with widely spaced uniseriate rows of areolae extending from the valve face onto the curving mantle; areolae circular or elliptical, sometimes transapically extended, opening externally into slight grooves in valve face; vela present; sternum variable but never very narrow; no rimoportulae; spathulate or dichotomously branched marginal spines conspicuous, single or in pairs between areolae; small plaques sometimes occur along valve margin; apical pore fields variable, containing a few isolated, often slightly rimmed pores to several rows of them; internally with no distinguishing features; 6-8 or more copulae per valve, usually extremely curved and almost certainly incomplete (open) bands and without areolae; Patrick & Reimer (1966) describe the striae as being radiate throughout most of the valve, and are crossed by fine lines; length is 7-25µm, breadth is 5-12µm; striae count is 14-18 in 10µm