Contributor: Pat Kociolek - September 2011
Length Range: 23-65 µm
Width Range: 5.5-9.0 µm
Striae in 10 µm: 13-15
Valves are lanceolate-clavate, with the headpole being rounded to narrowly acute and the footpole is narrowly rounded. The axial area is narrow at the poles, expanded to produce a lanceolate hyaline area running the length of the valve. The central area is not differentiated. The central nodule is distinct and round in shape. The raphe is straight and filiform. The raphe ends do not extend to the valve apices at either end. Striae are short, radiate along the length of the valve, with each stria comprised of a single elongated areola. Stigmata, septa and pseudosepta are lacking.
Basionym: Gomphonema brasiliense
Author: Grunow 1878
Length Range: µm
Striae in 10 µm:
Grunow, A. (1878). Algen und Diatomaceen aus dem Kaspischen Meere. In: O. Schneider (ed.), Naturwissenschafte Beiträge zur Kenntniss der Kaukasusländer, auf Grund seiner Sammelbeute. Dresden, pp. 98-132, pls. 3-4.
Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.