References:
Podzorski A.C. (1985): "An illustrated and annotatet chack-list of diatoms from the Black River Waterways, St. Elizabet, Jamaica", p.23, PL. 3, fig.2; F. Husted (1930):"Susswasser-Flora Miteleuropas", p.186,187, fig.258; Patric R. & Ch.W. Reimer (1966):"The diatoms of the United States", Vol.1, p.187,188; Pl.10, fig.1; Schmidt A. (1902):"Atlas der diatomaceenkunde", Vol.III, Taf.291, fig.9-14
Description:
Frustules are linear in girdle view; valve is linear, usually slightly arched, somewhat swollen to form more or less capitate ends; width of valve at the ends is usually a little greater than at centre; terminal nodules are very distinct and are at or near the very ends of ventral margin of valve; raphe appendage extends towards the valve centre from dorsal margin of terminal nodules; jelly pore present at one apex of valve; striae are equidistant, indistinctly punctate; length is 80-300µm, breadth is 2-5µm; striae count usually 15-19 in 10µm (Hustedt [1932] states that striae are 14-18 in 10µm; Cleve-Euler [1953] contends that striae are distinctly punctate, about 11-20 in 10µm, with valve length 80-300µm, breadth 1.5-8µm)
