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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Twaites ex W. Smith
Navarino, G. (1990). Observations on the frustule architecture of Mastogloia smithii, with particular reference to the valvocopulae and its integration with the valve. Diatom Research, 5 (2), 373-385; Podzorski A.C. (1985): "An illustrated and annotatet chack-list of diatoms from the Black River Waterways, St. Elizabet, Jamaica", p.29, Pl.5, fig. 21,22; Patric R. & Ch.W. Reimer (1966):"The diatoms of the United States", Vol.1,p.300, Pl.20, fig.8,9
Valve elliptical to elliptical-lanceolate with short, protracted, subrostrate to subcapitate ends; axial area is narrow and linear; raphe is filiform, very slightly lateral about midway between the centre and valve ends, and can sometimes have a very slight bulge or lateral displacement (this feature is characteristic in most Mastogloia species, but is usually more prominent); distal ends are curving in the same direction at extreme ends of the valve, where very small thickenings resembling terminal nodules are apparent; central area is small, elliptical to nearly quadrangular; margins do not extend to chambers' edge; punctate striae are parallel or very slightly radiate (punctae 14-17 in 10µm); loculi (6-8 in 10µm) of intercalary band about equal in size, with inner margins slightly convex; length is 20-45µm, breadth is 8-14µm (Hustedt  gives a length of up to 65µm, breadth up to 16µm); striae count is 18-19 in 10µm
some specimens have higher length and breadth values than as described for type
20 - 65 µm
8 - 16 µm
18 - 20
6 - 8