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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Sellaphora pupula rectangularis
Patrick, R. & Reimer, C. W (1966). The Diatoms of the United States I. Monographs of the Academy of Natural Sciences of Philadelphia. Pennsylvania. pp. 497; 558-559 [pl.47:12]
Stauroneis rectangularis Greg. 1854; Navicula pupula var. rectangularis (Greg.) Grun. in Cl. & Grun. 1880; Navicula pupula var. bacillaroides Grun. in Cl. & Grun. 1880; Hustedt (1961) recognizes this as a form rather than a variety of Navicula pupula
Valve is linear in general outline, slightly swollen in the middle portion; ends are broadly rounded, sometimes appearing slightly rostrate; striae as in nominate variety; length-to-breadth ratio, about 4:1; length of the same range as the nominate variety