• Category
  • Length Range
    8–22 µm
  • Width Range
    3.1-5.5 µm
  • Striae in 10 µm



Valves are linear-lanceolate with subcapitate ends, dorsiventral with convex dorsal side and more or less straight ventral side, 3.1-5.5 µm wide, 8-22 µm long. Ventral side of the valve has a pronounced medial expansion. Striae are biseriate, consisting of two rows of poroid areolae, 10-16 in 10 µm in the middle of the dorsal side. The central area occupies an expansion in the middle of the ventral side and has one isolated stigma. The raphe is straight, with the terminal raphe fissures curved to the ventral side. Apical pore fields occur on the ventral mantles.

The valve symmetry is as in a cymbelloid diatom, but presence of the apical pore fields and other characters place this genus within gomphonemoid diatoms.

Original Description

It is narrow, slightly arcuate, with rather square, slightly expanding apices. On the generally concave side are three rounded but gentle prominences; the cnetral one considerable, the lateral ones, which are near the ends, very slight. Striae conspicuous, sub-distant, about 20 in .001, not reaching, or hardly reaching, the median line, which seems to be, as in the known Cymbellae, a little nearer the ventral surface. there is in most cases a blank space round the central nodule. Length from .008 to .0012 inch. The characters of this species are very constant. It varies somewhat in size, and a little also in the form of the apices, which are in some less square than in others.

  • Basionym
    Cymbella sinuata
  • Author
    W.Greg. 1856
  • Length Range
    20-30 µm
  • Striae in 10µm

Original Images

Resinuata  Orig  Illustr
Resinuata  Orig Descr

Cite This Page

Potapova, M. (2009). Reimeria sinuata. In Diatoms of North America. Retrieved June 20, 2024, from https://diatoms.org/species/reimeria_sinuata


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