Diatoms of North AmericaDiatoms of North America

Gomphonema consector

M.H.Hohn and Hellerman 1963

Gomphonema Consector Guide
  • Category
    Asymmetric Biraphid
  • Length Range
    16.2-24.5 µm
  • Width Range
    5.3-6.0 µm
  • Striae in 10 µm
    13-15

Identification

Gomphonema Consector LM1 Gomphonema Consector LM2 Gomphonema Consector LM3 Gomphonema Consector LM Gomphonema Consector LM5 Gomphonema Consector LM6 Gomphonema Consector LM7
View image metadata
Gomphonema Consector Sem Wholevalve
Gomphonema consector SEM1 Gomphonema consector SEM3 Gomphonema consector SEM2

Description

Valves are clavate. The headpole is apiculate and the valve margin tapers to the footpole. The widest part of the valve is between the valve center and the headpole. The axial area is narrow and straight. The central area is transverse and rectangular. On one side of the valve, the central area is bounded by a shortened stria bearing an isolated stigma at its end. On the other side of the valve is a much shorter stria. The raphe is filiform and somewhat sinuous. The proximal raphe ends are weakly expanded; distal raphe ends are bent to the same side. Striae are weakly radiate throughout, somewhat curved and composed of areolae that number about 30 in 10 µm. Striae near the central area are somewhat more widely spaced than those closer to the valve apices.

Autecology

Gomphonema consector was described from Ridley Creek, Pennsylvania, a low conductivity circumneutral stream (Patrick and Reimer 1975). The specimens shown here are from an alpine lake in the Sierra Nevada Mountains of California (photo below). At this site, G. consector was associated with Eunotia sudetica, Gomphonema exilissimum, and two undescribed species of Gomphonema.

Kings Canyon2008353
Credit: Trailspace.com
Evolution Lake at an elevation of 3,313 m in the Sierra Nevada Range of central California, home of Eunotia sudetica.

Original Description

Valve clavate, apical and subrostrate, basal end tapering, rounded; length 18.2-30.7 µm, width 5.2-6.8 µm; striae punctate, slightly arcuate, radiate throughout, 10-15/10 µm; axial area linear; raphe thin, straight, terminal ends curved unilaterally, enclosed by striae; two opposing shortened striae form transapical rectangular central area; distinct isolated punctum.

  • Author
    M.H.Hohn and Hellerman 1963
  • Length Range
    18.2-30.7 µm
  • Width
    5.2-6.8 µm
  • Striae in 10µm
    10-15

Original Images

Gomphonema Consector Origimag001
Gconsector Type Sp2 Ed
Gconsector Type Sp4 Ed
Gomphonema Consector Origdesc002

Cite This Page

Bahls, L. (2013). Gomphonema consector. In Diatoms of North America. Retrieved October 30, 2024, from https://diatoms.org/species/gomphonema_consector

Responses

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