Navicula venerablis
-
Category
-
Length Range51-70 µm
-
Width Range8.7-9.5 µm
-
Striae in 10 µm10-12
-
Reported AsNavicula globulifera (Patrick and Reimer 1966)
-
ContributorMarina Potapova - Dec 2009
-
ReviewerSam Rushforth - Jul 2011
Identification
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
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.
-
AuthorM.H.Hohn and Hellerman 1963
-
Length Range59.3 µm
-
Width9.4 µm
-
Striae in 10µm11-12
Original Images
Cite This Page
Potapova, M. (2009). Navicula venerablis. In Diatoms of North America. Retrieved December 26, 2024, from https://diatoms.org/species/45974/navicula_venerablis
Responses
The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Navicula venerablis from all the stream reaches where it was present. Note that the relative abundance scale is the same on each plot. Explanation of each environmental variable and units are as follows:
ELEVATION = stream reach elevation (meters)
STRAHLER = distribution plot of the Strahler Stream Order
SLOPE = stream reach gradient (degrees)
W1_HALL = an index that is a measure of streamside (riparian) human activity that ranges from 0 - 10, with a value of 0 indicating of minimal disturbance to a value of 10 indicating severe disturbance.
PHSTVL = pH measured in a sealed syringe sample (pH units)
log_COND = log concentration of specific conductivity (µS/cm)
log_PTL = log concentration of total phosphorus (µg/L)
log_NO3 = log concentration of nitrate (µeq/L)
log_DOC = log concentration of dissolved organic carbon (mg/L)
log_SIO2 = log concentration of silicon (mg/L)
log_NA = log concentration of sodium (µeq/L)
log_HCO3 = log concentration of the bicarbonate ion (µeq/L)
EMBED = percent of the stream substrate that is embedded by sand and fine sediment
log_TURBIDITY = log of turbidity, a measure of cloudiness of water, in nephelometric turbidity units (NTU).
DISTOT = an index of total human disturbance in the watershed that ranges from 1 - 100, with a value of 0 indicating of minimal disturbance to a value of 100 indicating severe disturbance.
Navicula venerablis
- 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.