Neidiomorpha binodiformis | Species - Diatoms of North America

Category

Symmetric Biraphid
Length Range

20-35 µm
Width Range

7-8 µm
Striae in 10 µm

25-28

Reported As

Neidium binode (Patrick and Reimer, pg. 404, Pl. 37, Fig. 6)

Contributor

Sergio Mendoza - Jun 2015
Reviewer

Dennis Vander Meer - Apr 2016

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Identification

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Description

Valves are linear-elliptical and biundulate, with constricted central margins and rostrate apices. Striae are uniseriate, coarse, and parallel at the central area becoming weakly radiate near the apices. Areolae are transapically elongate near the raphe, becoming circular near the margin of the valve. A narrow longitudinal canal borders the valve margin. The central area is asymmetric and oval. The axial area is narrow and linear. The raphe is straight. The proximal raphe ends are straight, or deflected slightly to the primary side.

Note that this taxon was described (Krammer 1985) based on Neidium binodis sensu Germain 1981, as distinct from N. binodis (Ehrenberg) Hustedt. The original material of N. binodis (Ehrenberg) Hustedt, however, has not been examined and such work may change the standing of these two species.

Also note that Patrick and Reimer (1966) illustrate a taxon that conforms to N. binodiformis, but is named Neidium binode. It is likely that many of the North American reports do not distinguish, or confuse, these two species.

Autecology

Neidiomorpha binodiformis was found in a benthic collection from Cold Creek, San Bernadino County in southern California. It was also found in samples from the Spirit Lake fish hatchery, Dickinson County, Iowa. According to Cantonati et al. (2010), xxxxxxxxxxxxxxxx

Size Range, µm3

101-1000
Motility

Moderately motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Occurrence

Rare
Waterbody

Inland Rivers Lakes
Distribution

Western rivers 2004
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Original Description

Basionym

Neidium binodiforme
Author

Krammer 1985
Length Range

16-33 µm
Width

5-8 µm
Striae in 10µm

24-28

Original Images

Citations & Links

Citations

Cite This Page

Mendoza, S. (2015). Neidiomorpha binodiformis. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/50693/neidiomorpha_binodiformis

Responses

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