Kociolek and Stoermer 1988 Category: Asymmetrical biraphid
BASIONYM: Gomphoneis herculeana var. abundans Kociolek and Stoermer 1988
Contributor: Pat Kociolek -
Length Range: 76-160 µm
Width Range: 16-25 µm
Striae in 10 µm: 12-14 at the headpole, 13-16 at the footpole
Valves linear-clavate, with a swollen middle section of the valve. Axial area narrow, straight and forming a relatively small, irregularly rounded central area that bears a single stigma. Raphe lateral, weakly undulate, with small external proximal ends. Striae are biseriate, with the areolae arranged alternately. Striae are radiate, becoming strongly radiate near the footpole. Striae number 8 to 12 in 10 µm in the central portion of the valve, 12 to 14 in 10 µm at the headpole and 13 to 16 in 10 µm at the footpole. Longitudinal lines are positioned approximately one-half the way between the axial area and margin. The apical pore fields are distinctly bilobed.
Basionym: Gomphoneis herculeana var. abundans
Author: Kociolek and Stoermer 1988
Length Range: µm
Striae in 10 µm:
Kociolek, J.P. and Stoermer, E.F. (1988). A preliminary investigation of the phylogenetic relationships among the freshwater, apical porefield-bearing cymbelloid and gomphonemoid diatoms (Bacillariophyceae). Journal of Phycology 24: 377-385. 10.1111/j.1529-8817.1988.tb04480.x
Known only from Lake Tahoe and surrounding habitats, and from Montana.