Hohn & Hellerman 1963 Category: Symmetrical biraphid
BASIONYM: Navicula venerablis Hohn & Hellerman 1963
REPORTED AS: Navicula globulifera (Patrick and Reimer 1966)
Contributor: Marina Potapova - December 2009
Length Range: 51-70 µm
Width Range: 8.7-9.5 µm
Striae in 10 µm: 10-12
Valves are narrowly lanceolate with drawn-out subcapitate ends. The raphe is lateral, almost straight, but proximal parts of the raphe branches are very slightly deflected toward the secondary side. Proximal raphe ends are expanded. The axial area is narrow, linear; the central area is transversely elliptical. Striae are strongly radiate and bent in the middle of the valve, convergent at the apices, 10-12 in 10 µm. Long and short striae sometimes alternate around the central area. Areolae are 34-36 in 10 µm.
Basionym: Navicula venerablis
Author: Hohn & Hellerman 1963
Length Range: 59.3 µm
Width Range: 9.4 µm
Striae in 10 µm: 11-12
Valve narrowly elliptic-lanceolate, ends produced, subcapitate; length 59.3 µm, width 9.3 µm; striae lineolate, radiate at center becoming convergent at ends 11-12/10 µm, length irregular at center; axial area linear, terminal nodules distinct, raphe straight, terminal ends hooked unilaterally; central area transapically ovate.
Hohn, M.H. and Hellerman, J. (1963). The taxonomy and structure of diatom populations from three Eastern North American rivers using three sampling methods. Transactions of the American Microscopical Society 82(3):250-329.