Navicula venerablis
Hohn & Hellerman 1963 Category: Symmetrical biraphid
BASIONYM: Navicula venerablis Hohn & Hellerman 1963
REPORTED AS: Navicula globulifera (Patrick and Reimer 1966)
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Marina Potapova - January 2010
Length Range: 51-70 µm
Width Range: 8.7-9.5 µm
Striae in 10 µm: 10-12
Description
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.
Original Description
Basionym: Navicula venerablis
Author: Hohn & Hellerman 1963
Length Range: 59.3 µm
Width Range: 9.4 µm
Striae in 10 µm: 11-12
Original Description
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.
Original Images
Cite This Page:
Potapova, M. (2010). Navicula venerablis . In Diatoms of the United States. Retrieved June 17, 2013, from http://westerndiatoms.colorado.edu/taxa/species/navicula_venerablis
Species: Navicula venerablis
Contributor: Marina Potapova
Reviewer: Sam Rushforth
Image Credit: Marina Potapova
- Valves large
- Valves narrowly lanceolate with protracted ends
- Central area transversely elliptical
- Striae bent, strongly radiate in valve center
Valves are narrowly lanceolate with drawn-out subcapitate ends, 8.7-9.5 µm wide, 51-70 µm long. The central area is transversely elliptical. The striae are strongly radiate, bent in the middle of the valve and convergent at the apices, 10-12 in 10 µm. Areolae are 34-36 in 10 µm.
Compare
Navicula venerablis can be distinguished from other Navicula species by its large size and narrowly lanceolate valve outline.
Citations
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.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: