Diatoms of North AmericaDiatoms of North America

Sellaphora fusticulus

(Østrup) Lange-Bert. 2000

Sellaphora Fusticulus Guide
  • Category
    Symmetric Biraphid
  • Length Range
    29.1-45.5 µm
  • Width Range
    7-9 µm
  • Striae in 10 µm
    15-17 at the valve center, 18-20 at the apices
  • Synonyms
    Navicula laevissima f. fusticulus (Østrup) H.Kobayasi 1969
    Navicula wittrockii var. fusticulus (Østrup) A.Cleve 1953
    Navicula wittrockii f. fusticulus (Østrup) Hust. 1961

Identification

Sellaphora fusticulus LM5 Sellaphora fusticulus LM1 Sellaphora fusticulus LM2 Sellaphora fusticulus LM3 Sellaphora fusticulus LM4
View image metadata

Description

Valves are linear, with slightly convex margins. The apices are broadly rounded and weakly capitate. The axial area is narrow and linear. Canopea are not apparent in LM. The central area is elliptic to rounded, with shortened striae at the margins. The raphe is filiform to lateral. The proximal raphe ends are expanded and unilaterally deflected. The distal raphe ends hook onto the apices in the same direction as the proximal raphe deflection. The central striae are shortened and straight. The striae of the main body are radiate and weakly curved toward the valve margin, becoming more dense at the apices.

Sellaphora fusticulus is morphologically similar to S. laevissima, and has not been widely reported in the United States.

Autecology

Sellaphora fusticulus is morphologically similar to S. laevissima, and has not been widely reported in the United States. Here we show specimens from a eutrophic lake in east-central Minnesota. Specimens have also been observed in a New England river from a U.S. Geological Survey regional stream survey.

Sefusticulus
Credit: USGS/Biodata
The distribution of Sellaphora fusticulus in rivers of the United States. Accessed on 10 July, 2017.

Original Description

Valva sublineari sub apices rotundas leniter contracta. Raphe area angusta hyalina, media in parte valvae in aream transapicalem subellipticaum dilatata, cincta. Nodulis terminalibus extremis in apicibus situatis. Striis usqve ad apices radiantibus.

J: Havstrup F.K. Ferskv. I denne Prove findes Nav. Fusticulus ogsaa mindre (Long.5) og noget stribet helt retlinet.

  • Basionym
    Navicula fusticulus
  • Author
    Østrup 1910
  • Length Range
    64 µm
  • Width
    11 µm
  • Striae in 10µm
    16

Original Images

Nafusticulus Original Image
Nafusticulus Original Text

Cite This Page

Burge, D., Edlund, M. (2017). Sellaphora fusticulus. In Diatoms of North America. Retrieved April 19, 2024, from https://diatoms.org/species/sellaphora_fusticulus

Responses

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