Sellaphora fusticulus | Species - Diatoms of North America

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

Contributor

David R.L. Burge, Mark Edlund - Jun 2017
Reviewer

Marina Potapova - Sep 2017

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Identification

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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.

Size Range, µm3

10001-100000
Motility

Moderately motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Waterbody

Inland
Learn more about this

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

Citations & Links

Citations

Cite This Page

Burge, D., Edlund, M. (2017). Sellaphora fusticulus. In Diatoms of North America. Retrieved December 26, 2024, from https://diatoms.org/species/52412/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.