• Category
  • Length Range
    7.3-10.5 µm
  • Width Range
    3.3-5.0 µm
  • Striae in 10 µm
  • Synonyms
    Eolimna subminuscula (Manguin) Gerd Moser, Lange-Bert. and Metzeltin 1998
  • Reported As
    Navicula luzonensis ()



Valves are elliptical-lanceolate, with acute ends, 3.3-5.0 µm wide, 7.3-10.5 µm long. The raphe is filiform, with slightly bent branches. The axial area is thickened, linear, only slightly widened in the center. Striae are radiate throughout, 20-28 in 10 µm, uniseriate. Areolae round or transapically elongated, often visible in LM .


Eutraphentic species

Original Description

Valve eliptique lancéolée, à extrémités arrondie aiguës. Raphé droit; area axial très étroit, non élargi autour du nodule central. Stries radiales, un peu plus distantes dans la partie valvaire médiane, environ 25 en 10 µm, vers les extremites plus de 30. Long. 9-10 µm, larg. 4.5 µm. Pl. II, fig. 39. Cette espèce ne diffère de N. Lenzi Krasske (11: p. 556, Pl. XIX, fig. 11, 12) que par ses stries non ponctuées. Santa-Maria (XIV) R.: cuvette rocheuse à Potamogeton fluitans

  • Basionym
    Navicula subminuscula
  • Author
    Manguin 1942
  • Length Range
    9–10 µm
  • Width
    4.5 µm
  • Striae in 10µm

Original Images

Nasubminusc  Orig Illus
Nasubminusc  Orig Descr
Original text and images reproduced with permission by Paris: Le Laboratoire de cryptogamie du Museum national d'histoire naturelle.

EMAP Assessment

EMAP Distribution

N Subminiscula 20
Map 20

Response Plots

Navicula Subminuscula  Manguin


Apr 25, 2016 - Transfer from the genus Navicula to Craticula

This taxon appeared on the Diatoms of the US flora as Navicula subminuscula Manguin 1942 from May 2009 until April 2016. As of that date, the taxon appears as Craticula subminuscula (Manguin) Wetzel and Ector 2015.

Cite This Page

Potapova, M. (2009). Craticula subminuscula. In Diatoms of North America. Retrieved July 21, 2018, from https://diatoms.org/species/craticula_subminscula


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