Nitzschia amphibioides

Hustedt 1942      Category: Nitzschioid
BASIONYM: Nitzschia amphibioides Hustedt 1942

Nitzschia amphibia

 

Nitzschia balcanica

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Dessie Underwood - June 2013
Length Range: 9.5-22 µm
Width Range: 4.3-5.2 µm
Striae in 10 µm: 14-18

Description

Valves are linear to lanceolate and taper to bluntly rounded apices. The raphe is eccentric and located within a canal. The raphe lacks a central nodule. Fibulae are thick at the valve margin and typically extend across value to the opposing margin, although this feature is not visible in all specimens. Fibulae are irregularly spaced along the valve margin with 1-4 striae separating them. Striae are distinctly punctate.

There is confusion around both a taxon (and its name) similar to N. amphiboides. The taxon N. amphiboides has been called, in error, Nitzschia denticula Grunow. In fact, the name N. denticula is nomenclatural synonym of Denticula kuetzingii, described by Grunow (1862). The fibulae of D. kuetzingii completely extend across a valve from margin to margin with a similar thickness, while the fibulae of N. amphibioides decrease in thickness as they extend across the valve from margin to margin.

Note that the original description of N. amphibioides by Hustedt (1942) is of a large, broad (9-10 µm) valve. Hustedt reported this taxon from many slides, but the lectotype (Simonsen 1987, Plate 430, Fig. 9) that corresponds to the original description is of a taxon collected in Celebes. The specimens presented here conform to the very wide concept of the species as published by Krammer and Lange-Bertalot (1988, Taf. 78, Figs 27-29), a concept that appears to be quite unrelated to the type. Similarly, the specimens presented here are likely to belong to another taxon and additional work should be done to clarify their identity.



Original Description

Basionym: Nitzschia amphibioides
Author: Hustedt 1942
Length Range: 32-115 µm
Width Range: 9-10 µm
Striae in 10 µm: 11.5-14.0

Original Description

Schalen sehr robust, in großen Individuen linear mit parallelen Rändern und stumpf-keilförmig gerundeten Enden, in kleined Formen lanzettlich mit leicht geschnäbelten, stumpfen Enden, 32-115 µ lang, 9-10 µ breit. Keil stark exzentrisch, Kielpunkte kräftig, 5-7 in 10 µ. Zellwand grob struckturiert, Transapikalreihen 11,5-14 in 10 µ, Punkte (Poroide) 12-16 in 10 µ, unregelmäßig wellige Längsreihen bildend. Fig. 283 bis 288.

Nur auf Celebes gefunded. Vereinzelt im Towoetisee und Matanosee.

Original Images


Cite This Page:
Underwood, D. (2013). Nitzschia amphibioides. In Diatoms of the United States. Retrieved October 24, 2014, from http://westerndiatoms.colorado.edu/taxa/species/nitzschia_amphibioides

Species: Nitzschia amphibioides

Contributor: Dessie Underwood

Reviewer: Sarah Spaulding

Citations

Cleve, P.T. and Grunow, A. (1880). Beiträge zur Kenntniss der Arctischen Diatomeen. Kongliga Svenska-Vetenskaps Akademiens Handlingar, Vol: 17, Issue: 2, 121 pp., 7 pls.

Hustedt, F. (1942). Süßwasser-Diatomeen des indomalayischen Archipels und der Hawaii-Inslen. Internationale Revue der gesamten Hydrobiologie und Hydrographie 42(1/3):1-252.

Krammer, K. and Lange-Bertalot, H. (1988). Bacillariophyceae. 2. Teil: Bacillariaceae, Epithemiaceae, Surirellaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/2. Gustav Fisher Verlag, Jena.

Lange-Bertalot, H. and Krammer, K. (1993). Observations on Simonsenia and some small species of Denticula and Nitzschia. Nova Hedwigia, Beiheft 106: 121-131.

Simonsen, R. (1987). Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer, Berlin & Stuttgart 1: 525 pp.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID: 48049

Autecology Discussion

The specimens photographed here were collected from Collins Channel (Orange County, CA; latitude: 33.80959, longitude: 117.86157) on March 22, 2013. Water temperature was 24°C, conductivity was 2788 μS, and DO was 13 mg/L.

Images

Stream in Orange County, California (Collins Channel, lat 33.80959, long -117.86157) where photographed and measured specimens were collected.

Credit/Source: Photo provided by Aquatic Bioassay Consulting, Inc. Ventura, CA.