Navicula harmoniae | Species - Diatoms of North America

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

Contributor

Loren Bahls - Jan 2016
Reviewer

Marina Potapova - Jan 2016

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Identification

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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.

Size Range, µm3

1001-10000
Motility

Moderately motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Waterbody

Inland
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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

Citations & Links

Citations

Bahls, L. (2014) New diatoms from the American West--A tribute to citizen science. Proceedings of the Academy of Natural Sciences of Philadelphia 163: 61-84.

Cite This Page

Bahls, L. (2016). Navicula harmoniae. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/51238/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.