Frustulia pseudomagaliesmontana | Species

Category

Symmetric Biraphid
Length Range

30-45.7 µm
Width Range

5.8-6.2 µm
Striae in 10 µm

40-42

Contributor

Meredith Tyree Polaskey - May 2018
Reviewer

Sarah Spaulding - Jul 2018

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Identification

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Description

Valves are narrow, linear and lightly silicified. The valve margin is slightly irregular to undulate. The apices are rostrate to slightly subcapitate. The central nodule is slightly pinched together. Longitudinal ribs are narrow and slightly curved. The porte-crayon is relatively small and difficult to discern in LM. Both apical and transapical striae are parallel, but can be difficult to resolve in LM because they number roughly 40 in 10 μm. Under SEM, internally, the longitudinal ribs are narrow and irregular in thickness. The internal expression of the areolae are round to nearly rectangular. The apical striae become slightly offset from one another, particularly around the central area. A hyaline area is distal to the porto-crayon.

Autecology

Frustulia pseudomagaliesmontana has only been confirmed from North America. This taxon has been reported from the eastern United States. Images on this page are from surface sediments from lakes in New York, Connecticut and New Jersey. Frustulia pseudomagaliesmontana grows in both lentic and lotic environments and can at times reach moderately high abundance.

Size Range, µm3

11-100
Motility

Moderately motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Occurrence

Rare
Waterbody

Inland Rivers Lakes
Distribution

Northeast lake sediments
Learn more about this

Original Description

Frustulia pseudomagaliesmontana Camburn & Charles, sp. nov. (Pl. 18, figs. 12-16; Pl. 37, figs. 2, 3, SEM)

Valve narrow elliptic, margins may be slightly undulate; ends rostrate to subcapitate. Axial area narrow. Striae parallel to gently convergent at the ends. Striae, 37-40 in μm. Length, 41-44 μm. Breadth, 6-6.5 μm.

HOLOTYPE A.-G.C. 57556. In general diatom collection, Academy of Natural Sciences of Philadelphia.

Type locality. U.S.A., New York, Herkimer County, Fourth Lake (Bisby Lakes), 43°34’15’’ N, 74°58’15’’ W, Core 1, 0-1 cm, September 10, 1987.

Frustulia pseudomagaliesmontana is distinguished from F. magaliesmontana Choln. (Cholnoky 1957: 349, fig. 42) by its shorter length (41-44 μm compared to 55-70 μm for Cholnoky’s taxon).

Author

Camburn and D.Charles 2000
Length Range

41-44 µm
Width

6-6.5 µm
Striae in 10µm

37-40

Original Images

Frustulia Pseudomagaliesmontana Orig Illus

Frustulia Pseudomagaliesmontana Orig Desc

Citations & Links

Citations

Camburn, K.E. and Charles, D.F. (2000) Diatoms of Low-Alkalinity Lakes in the Northeastern United States Academy of Natural Sciences of Philadelphia, Special Publication 18, 152 pp.

Cite This Page

Polaskey, M. (2018). Frustulia pseudomagaliesmontana. In Diatoms of North America. Retrieved December 26, 2024, from https://diatoms.org/species/61988/frustulia-pseudomagaliesmontana

Responses

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