Grunowia solgensis

(A.Cleve) Aboal 2003      Category: Nitzschioid
BASIONYM: Nitzschia solgensis A.Cleve 1952

REPORTED AS: Nitzschia sinuata var. delognei (Lange-Bertalot 1980, p. 54-55; Figs 77-86, 155, 156) 

Gomphosphenia lingulatiformis


Gyrosigma acuminatum

LM scalebar = 10 µm = 80 pixels.


Contributor: Ian Bishop - May 2017
Length Range: 9-13 µm
Width Range: 2.9-3.5 µm
Striae in 10 µm: 23-26


Valves are small and lanceolate. Larger valves have protracted apices, which can be recurved dorsally. Striae are weakly radiate. Areolae are coarse and irregularly spaced, particularly near the apical axis. Fibulae are coarse and extend approximately to the apical axis, numbering 6-7 in 10 µm.

This taxon is often reported as Nitzschia sinuata var. delognei (e.g. Krammer and Lange-Bertalot 1988; Potapova and Charles 2003, Morales and Vis 2007), and is considered to be closely related to other taxa in the Nitzschia sinuata group, including N. sinuata var. sinuata and N. sinuata var. tabellaria. However, upon closer ultrastructural examination under SEM, Kobayasi and Kobori (1990) determined that N. sinuata var. delognei differs considerably from the nominate variety, most prominently in terms of areolar occlusion (N. sinuata var. delognei has them, N. sinuata does not). This difference was used to argue that N. sinuata var. delognei should not be considered a variety within the N. sinuata, but rather separated and raised to the rank of species. Cleve-Euler was the first to recognize this taxon at the specific rank and used the specific epithet “solgensis” because an “N. delognei” already existed at the time of publication.

Original Description

Basionym: Nitzschia solgensis
Author: A.Cleve 1952
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Bishop, I. (2017). Grunowia solgensis. In Diatoms of the United States. Retrieved April 23, 2018, from

Species: Grunowia solgensis

Contributor: Ian Bishop

Reviewer: Sarah Spaulding


Cleve-Euler, A. (1952). Die Diatomeen von Schweden und Finnland. Part V. (Schluss.) . Kongliga Svenska Vetenskaps-Akademiens Handligar, ser. 4,, Vol: 3, Issue: 3, pp.1-153.

Kobayasi, H., Kobori, S. and Sunaga, S. (1990). Taxonomy and morphology of two forms of the Nitzschia sinuata complex. In: Proceedings of the 11th International Diatom Symposium. San Francisco, California (pp. 12-17).

Potapova, M. and Charles, D. (2007). Diatom metrics for monitoring eutrophication in rivers of the United States. Ecological Indicators 7: 48-70.

Potapova, M. and Charles, D. F. (2003). Distribution of benthic diatoms in U.S. rivers in relation to conductivity and ionic composition. Freshwater Biology 48: 1311-1328.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Grunowia solgensis CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion

This taxon has a broad North American distribution (reported as Nitzschia sinuata var. delognei) from the Pacific Northwest (personal observation), the Laurentian Great lakes (Stoermer et al. 1999), to the southeastern Piedmont and southern Appalachian regions (Bishop et al., accepted). Potapova and Charles (2003) report a conductivity optimum for this taxon of 335 μS cm-1. It has also been reported as indicative of low total phosphorus levels in samples collected across the United States and in the central and western plains in particular (Potapova and Charles 2007).