Diatoms of North AmericaDiatoms of North America

Navicula harmoniae

Bahls 2014

Navicula Harmoniae Guide
  • Category
    Symmetric Biraphid
  • Length Range
    33-68 µm
  • Width Range
    8.1-10.2 µm
  • Striae in 10 µm
    9-13 at valve center, 13-16 near the apices

Identification

Navicula harmoniae LM1 Navicula harmoniae LM2 Navicula harmoniae LM3 Navicula harmoniae LM4 Navicula harmoniae LM5 Navicula harmoniae LM6 Navicula harmoniae LM7
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Description

Valves are lanceolate with narrowly rounded apices. The axial area widens gradually from apex to valve center where it merges with a rhombic central area. The axial and central areas form a narrow lanceolate space. The raphe is filiform and lies along the center of the axial area. Proximal raphe ends are expanded and deflected slightly toward the secondary side of the valve. Striae are sinuous and strongly radiate near the valve center, becoming straight and parallel near the apices. Striae around the central area are alternately long and short and more widely spaced than striae near the apices. Areolae in the striae number 30-35 in 10 μm.

Autecology

Navicula harmoniae is known only from the type locality, a spring in the mountains of northern California.

Original Description

Valves are lanceolate with weakly protracted apices in smaller specimens. Valve length 33.0-68.1 μm; valve width 8.1-10.2 μm. The axial area widens gradually from apex to valve center where it merges with a rhombic central area. Together, the axial and central areas form a narrow lanceolate space. The raphe is filiform and lies along the center of the axial area. Terminal raphe fissures form hooks that open towards the secondary side of the valve. Proximal raphe ends are expanded and deflected slightly toward the secondary side of the valve. Striae are sinuous and radiate near the valve center, becoming straight and parallel near the apices. Voigt faults are distinct and often marked by short striae. Striae around the central area are alternately long and short and more widely spaced than striae near the apices. Striae number 9-13 in 10 μm at valve center, 13-16 in 10 μm near the apices. Arolae in the striae number 30-35 in 10 μm.

  • Basionym
    Navicula harmoniae
  • Author
    Bahls 2014
  • Length Range
    33.0-68.1 µm
  • Width
    8.1-10.2 µm
  • Striae in 10µm
    9-13 at valve center, 13-16 near the apices

Original Images

Navicula Harmoniae Origimag001

Cite This Page

Bahls, L. (2016). Navicula harmoniae. In Diatoms of North America. Retrieved November 21, 2024, from https://diatoms.org/species/navicula_harmoniae

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Navicula harmoniae 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.