• Category
  • Length Range
    37.4-51.5 µm
  • Width Range
    7.7-10.7 µm
  • Striae in 10 µm
    18-21 in the valve center, 20-23 at the ends



Valves are linear, with bluntly rounded, subcapitate apices. The central area is asymmetric to the apical axis; the central area extends to the valve margin on the secondary side of the valve. Striae are composed of irregularly spaced areolae. The areolae number 20 to 25 in 10 µm. The striae are slightly radiate in the center of the valve, becoming convergent near the ends. The raphe is lateral becoming filiform near the ends. The axial area is linear and bounded by a longitudinal row of areolae on each side. Proximal raphe ends are inflated and weakly deflected to the secondary side. The distal raphe ends are sickle shaped, unilaterally opened to the secondary side.

Soninkhishig et al. (2009) observed external proximal raphe ends as unilaterally deflected “croziers”, hooked to the secondary side. Internally, the proximal raphe ends are shown as simple and slightly expanded.


Anomoeoneis fogedii was described from an alkali fen impacted by row-crop agriculture in northwestern Iowa (Reimer 1982). Anomoeoneis fogedii has also been reported from a few calcareous fens in Minnesota (Soninkhishig et al. 2006).

Anfogedii Live
Credit: Edlund in Soninkhishig et al. 2006
Live cell from Lake Itasca State Park, Minnesota, USA
Anfogedii 10
Credit: Edlund in Soninkhishig et al. 2006
Girdle view cell with an internal valves.

Original Description

Valvae lineares, marginibus leniter convexis, apicibus rostratis, areis aialibus, angustis leniter arcuatis, punctatis in seriebus singulis limtatis, areis centralibus asymetricus quibusque latere singulari striis nullis, raphis lateralibus ramis raphium leniter arcuatis, raphis distalibus et proximalibus in eodem modo deflectentibus, striis punctatis ad centrum radiatis, ad extremitates sensim convergentibus, punctis pro parte maxima irregularibus, ad extremum regularibus. Longitudo 43-54 µm. Latitudo 10-11.5 µm. Striae 17-18/10 µm ad apices 19-21/10 µm.

Valves linear with slightly convex sides and protracted, rostrate ends. Axial are narrow, slightly curved, formed by a single row of punch on either side. Central area asymmetrical, one side reach the margin. Raphe lateral with slightly curved branches. Proximal and distal raphe ends curved in the same direction. Striae slightly radiate around mid-valve becoming slightly convergent at the ends; punctate. Puncta irregularly spaced except at the ends where they are close and regularly spaced. Length 43-54 µm. Width 10-11.5 µm. Striae 17-18/20 µm becoming ca. 19-21 µm at the ends.

Type locality: Iowa, Dickinson Co., Excelsior Fen, Fen #7. Orange floc in warm pool. Coll.: R.E. Mitchem. August 3, 1972. (I.L.L. Slide SP 33 - Holotype).

  • Author
    Reimer 1982
  • Length Range
    45-54 µm
  • Width
    10.0-11.5 µm
  • Striae in 10µm
    17-18 in the center valve, 19-21 at the ends

Original Images

Anomoneis fogedii orig illus
Anomoeoneis fogedii orig descr

Cite This Page

Burge, D., Edlund, M. (2015). Anomoeoneis fogedii. In Diatoms of North America. Retrieved April 16, 2024, from https://diatoms.org/species/anomoeoneis_fogedii


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