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.
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
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
Lowe, R., Kheiri, S. (2015). Stephanocyclus meneghinianus. In Diatoms of North America. Retrieved October 30, 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.