Nupela subrostrata | Species - Diatoms of North America

Category

Symmetric Biraphid
Length Range

14-29 µm
Width Range

3.4-5.1 µm
Striae in 10 µm

20-24

Contributor

Marina Potapova - Nov 2010
Reviewer

Sarah Spaulding - Nov 2010

Compare

Identification

View image metadata

Description

Valves are linear to linear-lanceolate with slightly drawn-out ends. The raphe is absent on one valve. The rapheless valve has a narrowly rhomboid axial area, which sometimes widens in the middle portion of the valve to form an asymmetrical central area. The raphe valve has a narrowly lanceolate axial area and circular or elliptical, sometimes asymmetrically expanded central area. The raphe has a slightly curved external and straight internal slit. The axial and central areas often have siliceous thickenings and depressions. The proximal raphe ends are slightly expanded externally. Internally, the proximal raphe ends are bifurcated and turned sharply backwards. Striae are radiate through both valves, 20-24 in 10 μm. The external openings of the areolae are covered by the kidney-shaped hymens.

Autecology

Size Range, µm3

101-1000
Motility

Slightly motile
Attachment

Unattached
Habitat

Benthic
Colony

Solitary
Waterbody

Inland
Distribution

Northeast lake sediments
Learn more about this

Original Description

Schalen linear mit wenig konvexen Seiten und schwach vorgezogenen, stumpf gerundeten Enden, um 20 μ lang, etwa 4 μ breit. Raphenschale mit gerader, fadeförmiger Raphe, mit voneinander entfernt gestellten Zentralporen; Axialarea sehr eng, Zentralarea ziemlich groß, annähernd kreisförmig; Transapikalstreifen ziemlich kräftig, durchweg – besonders vor den Polen – radial, in der Mitte etwa 20-24 in 10 μ, gegen die Enden wenig oder gar nicht enger werdend. Raphenlose Schale mit schmal lanzettlicher Pseudoraphe, Transapikalenstreifen etwa 24 in 10 μ, durchschnittlich etwas dichter gestellt als auf der Raphenschale und etwas weniger stark radial.

Basionym

Achnanthes subrostrata
Author

Hust. 1942
Length Range

20 µm
Width

4 µm
Striae in 10µm

20-24

Original Images

Citations & Links

Citations

Cite This Page

Potapova, M. (2010). Nupela subrostrata. In Diatoms of North America. Retrieved December 21, 2024, from https://diatoms.org/species/44998/nupela_subrostrata

Responses

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