• Category
  • Length Range
    31.9-39.9 µm
  • Width Range
    8.9-9.8 µm
  • Striae in 10 µm
    11-14 in the center valve, 14-16 at the ends



Valves are lanceolate-clavate, with an inflated central valve. The valve tapers from the center to a rounded headpole. The valve markedly tapers from the center to a narrow footpole. The axial area is lanceolate. A single stigma is present. The raphe is lateral, except at the proximal and distal raphe ends. Proximal raphe ends curve toward the stigma. Striae are parallel to weakly radiate at the center valve. Striae are parallel at the headpole and radiate at the footpole. A distinct porefield is present at the footpole.


Gomanubr  Biodata Map
Credit: USGS BioData
Distribution of Gomphonema manubrium in rivers of the continental U.S. based on the National Water Quality Assessment program. Retrieved 02 May 2016.

Original Description

  1. Orono River, Maine (B. A.). G. Manubrium n. sp.
  • Author
    Fricke in Schmidt et al. 1904

Original Images

Gomphonema manubrium orig illus
G Manubrium Origdesc

Cite This Page

Polaskey, M., Bishop, I. (2016). Gomphonema manubrium. In Diatoms of North America. Retrieved July 24, 2024, from https://diatoms.org/species/gomphonema_manubrium


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