Cymbopleura naviculiformis | Species - Diatoms of North America

Category

Asymmetric Biraphid
Length Range

35-40 µm
Width Range

9.1-11.4 µm
Striae in 10 µm

10-16 at center valve, 15-19 at the ends

Reported As

Cymbella naviculiformis (Patrick and Reimer 1975, plate 4, fig. 9)
Cymbella naviculiformis (Krammer and Lange-Bertalot 1986, fig. 145: 6-11)

Contributor

Loren Bahls - Jul 2012
Reviewer

Sarah Spaulding - Jul 2012

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Identification

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Description

Valves are elliptic-lanceolate and moderately dorsiventral, with a strongly arched dorsal margin and a slightly convex to nearly flat ventral margin. Apices are rostrate to subcapitate. The axial area is narrowly lanceolate and expands gradually towards a large rounded central area. The raphe is lateral and becomes filiform near the proximal ends, which are deflected slightly towards the ventral margin. Proximal raphe ends are not expanded and tipped with short hooks. Distal raphe ends are deflected dorsally. Striae are slightly radiate throughout and somewhat more closely spaced on the ventral side. Areolae number about 35 in 10 µm.

Autecology

Cymbopleura naviculiformis is widely distributed in small lakes and streams in mountain regions of the Northwest United States. Here it prefers well oxygenated, circumneutral and slightly alkaline waters with low concentrations of dissolved solids (see table below). In contrast, C. amphicephala prefers waters with higher pH, alkalinity, and dissolved solids. Patrick & Reimer (1975) report Cymbella naviculiformis as widely distributed throughout the United States.

Size Range, µm3

101-1000
Motility

Slightly motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
BCG

BCG 3
Waterbody

Inland
Distribution

Western rivers 2004 California coastal rivers 2017 Northeast lake sediments
Learn more about this

Credit: Montana Diatom Database

Abundance-weighted means of selected water quality variables measured concurrently with the collection of samples containing Cymbopleura naviculiformis.

Credit: Loren Bahls

Paradise Spring Brook, Glacier National Park, Montana: home of Cymbopleura naviculiformis.

Original Description

Basionym

Cymbella naviculiformis
Author

Auersw. ex Heib. 1863

Original Images

Citations & Links

Citations

Cite This Page

Bahls, L. (2012). Cymbopleura naviculiformis. In Diatoms of North America. Retrieved December 16, 2024, from https://diatoms.org/species/47600/cymbopleura_naviculiformis

Responses

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