Wm. Smith. 1856.
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Wm. Smith in Syn. British Diat., vol. 2, pp. 65-66, pl 62, fig. 389. 1856.
Ecology Littoral form sometimes found in slow moving streams.
Size ranges and morphology
Length is 30-60 (Patrick and Reimer 1966).
Breadth is 8-12 (Patrick and Reimer 1966).
Striae range is 9-10 (Patrick and Reimer 1966).
Loculi range is 6-8 (Patrick and Reimer 1966).
Puncate range is 20 (Patrick and Reimer 1966).
Other morphological features Valve has double row of punctae seperated by thickened costate ribs.