• Category
  • Diameter
    6.24-18.12 µm
  • Striae in 10 µm
    7-8 (chambered striae by circumference)
  • Synonyms
    Cyclotella meneghiniana Kütz. 1844



Valves are disc-shaped, with a narrow mantle. The valve face may be flat or transversely undulate. The central area is distinct and isolated from the marginal chambered striae. The central area covers 1⁄ 2 to 1⁄ 3 of the valve face. The central area contains 1-4 fultoportulae, which are distinct in LM. In the SEM, marginal fultoportulae are positioned on each costa. One to two rimoportulae are present near the valve margin, in line with a costa. Marginal spines may be present, positioned in line with each costa. The number of costae (interstriae) in 10 µm is 12-15.


This taxon is widespread and particularly common in shallow, nutrient rich waters.

2012 0057 1
Credit: Somayyeh Kheiri
Live cell of Cyclotella meneghiniana with 10 um scale bar.
Live4 2012 0057
Credit: Somayyeh Kheiri
Live cell of Cyclotella meneghiniana in girlde view with 10 um scale bar.
Iowa River Cyclotella Bloom
Credit: Rex Lowe
Bloom of diatoms in the Iowa River (Cyclotella meneghiniana dominant).

Original Description

  • Author
    Kütz. 1884
  • Length Range
    21 µm

Original Images

Cyclotella meneghiniana orig illus
Cyclotella meneghiniana orig descr


Mar 20, 2024 - Correction of the ending of the specific epithet to match Latin gender

From 8/9/2022 to 3/20/2024, this taxon appeared as Stephanocyclus meneghiniana (Kütz) Kulikovskiy, Genkal and Kociolek. As of this date, the epithet is corrected to end in -us to match the genus name. - S. Spaulding

Aug 29, 2022 - Transfer to Stephanocyclus

From 6/9/2012 to 8/29/2022, this taxon appeared as Cyclotella meneghiniana Kütz. Following Kulikovskiy et al. (2022), it is transferred to Stephanocyclus meneghiniana (Kütz.) Kulikovskiy, Genkal and Kociolek 2022. - S. Spaulding

Cite This Page

Lowe, R., Kheiri, S. (2015). Stephanocyclus meneghinianus. In Diatoms of North America. Retrieved May 19, 2024, from https://diatoms.org/species/stephanocyclus_meneghinianus


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