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Navicula eidrigiana

Carter 1979      Category: Symmetrical biraphid

REPORTED AS: Navicula cincta var. heufleri (Hustedt 1930, p. 298, Fig. 511) | Navicula heufleri (Patrick and Reimer, p. 515, Plate 49, Fig. 6) | Navicula walkeri (Patrick and Freese, p. 217, Plate 2, Fig. 12) 

Navicula duerrenbergiana


Navicula elsoniana

LM scalebar = 10 µm = 80 pixels.


Contributor: Loren Bahls - January 2016
Length Range: 21-49 µm
Width Range: 5.4-8.4 µm
Striae in 10 µm: 12-14


Valves are lanceolate to elliptic-lanceolate with narrowly rounded apices. The axial area is very narrow and linear. The central area is highly variable in shape and size, from elliptic to transversely rectangular, and often asymmetric. The raphe is filiform with tear-shaped proximal raphe ends that are deflected slightly to one side. The lineate striae are radiate, becoming convergent at the apices. Striae are unevenly spaced around the central area. The areolae are easily observed under LM and number 28-34 in 10 µm.

Original Description

Author: Carter 1979
Length Range: 20-55 µm
Width Range: 6-8 µm
Striae in 10 µm: 10-12.5

Original Description

Original Images

Cite This Page:
Bahls, L. (2016). Navicula eidrigiana. In Diatoms of the United States. Retrieved May 24, 2018, from

Species: Navicula eidrigiana

Contributor: Loren Bahls

Reviewer: Marina Potapova


Carter, J.R. (1979). On the identity of Navicula cincta Ehrenberg. Bacillaria 2, J. Cramer, Braunschweig, pp. 73-84.

Hustedt, F. (1930). Bacillariophyta (Diatomeae). In: Die Subwasser Flora Mitteleuropas. (A. Pascher, ed.),10, Gustav Fischer, Jena. 468 pp.

Krammer, K. and Lange-Bertalot, H. (1986). Bacillariophyceae. 1. Teil: Naviculaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Süsswasserflora von Mitteleuropa, Band 2/1. Gustav Fisher Verlag, Jena. 876 pp.

Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.

Patrick, R.M. and Freese, L.R. (1961). Diatoms (Bacillariophyceae) from Northern Alaska. Proceedings of the Academy of Natural Sciences of Philadelphia 112(6):129-293.

Patrick, R.M. and Reimer, C.W. (1966). The Diatoms of the United States exclusive of Alaska and Hawaii, V. 1. Monographs of the Academy of Natural Sciences of Philadelphia 13.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula eidrigiana CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46496

Autecology Discussion

Navicula eidrigiana is an uncommon resident of brackish springs and small streams on the Northwestern Great Plains. It typically prefers waters with a higher electrolyte content than Navicula libonensis. Some of the specimens on this page come from Iron Spring on the Custer National Forest in Carter County, Montana (photo below). Iron Spring has a pH of 8.32, conductivity of 2740 µS/cm, and temperature of 22.2 C.


Iron Spring, Custer National Forest, Carter County, Montana: home of Navicula eidrigiana.

Credit/Source: Loren Bahls