Gomphoneis eriense var. angularis | Species

Category

Asymmetric Biraphid
Length Range

34-67 µm
Width Range

8-12 µm
Striae in 10 µm

10-13 at the central portion, 14-16 at the poles

Contributor

Pat Kociolek - Feb 2011
Reviewer

Rex Lowe - May 2011

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Identification

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Description

Valves trullate, with broadest portion of the valve outline located towards the footpole from the central nodule. Apices rounded. Raphe distinctly undulate, with rounded external proximal ends. The axial area is narrow, straight, expanded slightly to form a linear-ellipsoidal central area that bears a single, relatively large stigma. A longitudinal line is positioned next to, or near, the axial area. Striae are distinctly biseriate, radiate near the central area, becoming parallel then radiate at the headpole, and becoming strongly radiate at the footpole. A distinct apical pore field is present at the footpole.

Autecology

Size Range, µm3

1001-10000
Motility

Moderately motile
Attachment

Vertical
Habitat

Benthic
Waterbody

Inland
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Original Description

Author

Kociolek and Stoermer 1988

Citations & Links

Citations

Kociolek, J.P. and Stoermer, E.F. (1988) Taxonomy, ultrastructure and distribution of Gomphoneis herculeana, G. eriense and closely related species (Naviculales: Gomphonemataceae) Proc. Acad. Nat. Sci. Phil. 140: 24-97 http://www.jstor.org/stable/4064935

Cite This Page

Kociolek, P. (2011). Gomphoneis eriense var. angularis. In Diatoms of North America. Retrieved November 21, 2024, from https://diatoms.org/species/gomphoneis_angularis

Responses

The 15 response plots show an environmental variable (x axis) against the relative abundance (y axis) of Gomphoneis eriense var. angularis 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.