• Category
  • Length Range
    56.6-130.7 µm
  • Width Range
    25-27 at the valve center, 29-30 at the widest µm
  • Striae in 10 µm



Valves are weakly panduriform, with broadly rounded apices. The axial area is linear-lanceolate, expanding to a circular central area. The conopeum is large and extends transapically from the raphe branches to cover 1/2 of the valve face. The shape of the conopeum is also panduriform, narrowing at the apices and near the central area. however, the conopeum secondarily expands at the central area becoming circular in shape. The raphe is lateral with expanded, unilaterally deflected proximal ends. The distal raphe ends are externally hooked on the valve face in the same direction as the proximal ends and internally continue onto the face-mantle junction in the shape of a comma. Striae are parallel at the central area, becoming radiate at the apices. The areolae composing the striae occur 35-36 in 10 µm.


This taxon was described from Massachusetts (Patrick and Reimer 1966). It was recently reported from wetlands of Arkansas (Burge 2014) and Japan (Kihara et al. 2015). The images shown on this page are from from lake sediment cores from Moody Lake, Chisago County, Minnesota.

Original Description

Grande forme à centre excavé et à area rugueuse dessinée par Wolle sous le nom de N. moesta A S., ce qui est évidemment une erreur, la forme de Schmidt étant un Diploneis. (Je n'ai pu trouver oú Wolle a pris son dessin.)

  • Basionym
    Navicula americana var. moesta
  • Author
    Temp. and H.Perag. 1908

Original Images

Naamericana Moesta  Originaltext

Cite This Page

Burge, D, and Edlund, M. (2017). Sellaphora moesta. In Diatoms of North America. Retrieved July 23, 2018, from https://diatoms.org/species/sellaphora_moesta


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