• Category
  • Length Range
    3-15 µm
  • Width Range
    2.6-4.5 µm
  • Striae in 10 µm



Valves lanceolate to elliptical-lanceolate, with slightly protracted apices, often slightly asymmetric about apical and transapical planes. The smallest valves may become oval. One valve slightly concave, with long raphe slits. The other valve, slightly convex, with distinctly shorter raphe slits and widely separated central endings. Terminal raphe fissures forming a curved opening to the primary side of the valve. Axial area linear-lanceolate, sometimes widening into a small, round or elliptical central area. Transapical striae slightly radiate, becoming parallel or slightly convergent near the poles, 40-48 in 10 μm. Areolae form 3-4 longitudinal rows on each side of the raphe. Outer openings of areolae are transapically elongate, covered by hymenes lying flush with the valve surface. Inner openings of areolae are small, oval foramina.


Original Description

  • Author
    Ponader, R.L.Lowe and Potapova in Potapova et al. 2003

Original Images

Nuneglecta  Orig Ill
Orig Descr  Nupela Neglecta
Original text and images reproduced with permission by the author.

Cite This Page

Potapova, M. (2010). Nupela neglecta. In Diatoms of North America. Retrieved November 15, 2019, from https://diatoms.org/species/nupela_neglecta


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