Diatoms of North AmericaDiatoms of North America

Ninastrelnikovia gibbosa

(Hust.) Lange-Bert. and Fuhrmann 2014

Ninastrelnikovia gibbosa guide
  • Category
    Symmetric Biraphid
  • Length Range
    18.5-21 µm
  • Width Range
    4.0-5 µm
  • Striae in 10 µm
    15-17
  • Synonyms
    Navicula gibbosa Hust.

Identification

Ninastrelnikovia gibbosa LM3 Ninastrelnikovia gibbosa LM7 Ninastrelnikovia gibbosa LM4 Ninastrelnikovia gibbosa LM8 Ninastrelnikovia gibbosa LM6 Ninastrelnikovia gibbosa LM5 Ninastrelnikovia gibbosa LM9
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Description

Valves are broadly cruciform, with a broad gibbous mid-valve and broadly rounded apices. The raphe is straight. Proximal raphe ends are straight and relatively distant from one another. Distal raphe ends are straight. The central nodule is relatively thick and broad. The axial area is linear and narrow, becoming broad and at the valve center. Striae are relatively coarse, broadly spaced and restricted to the valve margin.

Cells are often joined into colonies, with the valve faces joined together by linking spines (Lange-Bertalot and Furhmann 2014). Structures visible in SEM are distinctive and further distinguish this taxon from Chamaepinnularia and other small pennate forms.

Autecology

This taxon was originally described from Sumatra (Hustedt 1937). It is rare in North America, and seems to be characteristic of small ponds or pools of water that experience drying. It is likely that it has been misidentified as one of a number of small diatom genera.

Original Description

173. Navicula gibbosa nov. spec. Schalen linear, in der Mitte stark transapikal aufgetrieben, an den Enden stumpf gerundet, nicht vorgezogen, 19-20 µ lang, in der Mitte 4,5, sonst 2,5 µ breit. Raphe gerade, mit auffällig entfernt gestellten Zentralporen. Axialarea eng, gegen die Mitte allmählich in eine große, elliptisch-lanzettliche Zentralarea übergehend. Transapikalstreifen ziemlich grob, leicht radial, etwa 16 in 10 µ. Taf. XVIII, Fig. 10.

Fundort: Nordsumatra: Selten in zwei Proben aus der breitesten Stelle der Inundationszone des Tobasees.

Über den ökolgischen Charakter läßt auf Grund dieses beschränkten Vorkommens nichts sagen, möglicherweise handelt es sich ebenfalls um eine aërophile Art .

Die Art ist habituell genügend charakterisiert und steht zu anderen kleinen Formen kaum in Beziehung.

  • Basionym
    Navicula gibbosa
  • Author
    Hustedt 1937
  • Length Range
    19-20 µm
  • Width
    4.5 µm
  • Striae in 10µm
    16

Original Images

Navicula gibbosa orig illus
Navicula gibbosa orig desc

Cite This Page

Davis, C., Kheiri, S. (2021). Ninastrelnikovia gibbosa. In Diatoms of North America. Retrieved October 30, 2024, from https://diatoms.org/species/ninastrelnikovia_gibbosa

Responses

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