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Navicula ludloviana

A.Schmidt 1876      Category: Symmetrical biraphid

REPORTED AS: Navicula ludloviana (Patrick and Reimer 1966, p. 532, plate 51, fig. 2) | Navicula ludloviana (Lange-Bertalot 2001, p. 46, fig. 63: 1) 

Navicula longicephala


Navicula lundii

LM scalebar = 10 µm = 20 pixels.


Contributor: Loren Bahls | Marina Potapova - September 2015
Length Range: 63-163 µm
Width Range: 20-33 µm
Striae in 10 µm: 6-9


Valves are lanceolate, with attenuated apices in larger specimens and blunt subrostrate apices in smaller specimens. The axial area widens gradually from the apices to a rhombic central area. The raphe is lateral. Proximal raphe ends are inflated and terminal raphe fissures are comma-shaped. Striae are strongly radiate throughout, somewhat curved and alternately long and short around the central area. Areolae number about 28 in 10 µm.

Original Description

Author: A.Schmidt 1876
Length Range: µm
Striae in 10 µm:

Original Description

Original Images

Cite This Page:
Bahls, L., and Potapova, M. (2015). Navicula ludloviana. In Diatoms of the United States. Retrieved May 23, 2018, from

Species: Navicula ludloviana

Contributor: Loren Bahls | Marina Potapova

Reviewer: Sarah Spaulding


Bahls, L.L. and Potapova, M. (2015). Two new species of Navicula (Bacillariophyta, Naviculales) from the Cascade Mountains of the American Northwest. Phytotaxa 218 (3): 253–267. 10.11646/phytotaxa.218.3.4

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 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.

Schmidt, A. (-). (1874-1959). Atlas der Diatomaceen-Kunde, von Adolf Schmidt, continued by Martin Schmidt, Friedrich Fricke, Heinrich Heiden, Otto Muller, Friedrich Hustedt. Reprint 1984, Koeltz Scientific Books, Konigstein, 480 plates.

Sovereign, H.E. (1958). The diatoms of Crater Lake, Oregon. Transactions of the American Microscopical Society 77(2):96-134.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula ludloviana CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46270

Autecology Discussion

Extant populations of Navicula ludloviana have been recorded from Crater Lake, Diamond Lake, Upper Klamath Lake, Lake Creek and Snow Creek in Oregon, and from Lake Washington in Washington. Values for pH at these locations range from 7.1 to 9.5 and conductivity values range from 27 to 38 µS/cm. Navicula ludloviana has also been recorded from Neogene to Pleistocene fossil deposits in California, Oregon, and Washington (Bahls and Potapova 2015).


Snow Creek, Deschutes County, Oregon: home of Navicula ludloviana.

Credit/Source: U. S. Forest Service