Navicula germainii

Wallace 1960      Category: Symmetrical biraphid
BASIONYM: Navicula germainii Wallace 1960
SYNONYM(S): Navicula viridula var. germainii (Wallace) Lange-Bertalot  

Navicula galloae


Navicula geronimensis

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - February 2011
Length Range: 32-39 µm
Width Range: 7.0-8.3 µm
Striae in 10 µm: 13-15


Valves are lanceolate with drawn-out apices. The axial area is narrow and straight. The central area is slightly asymmetric and elliptical. The raphe is straight, with external proximal raphe ends slightly dilated and bent toward the primary side of the valve. The central nodule is asymmetrically expanded on the internal valve surface to the primary side. Terminal raphe fissures are hooked to the secondary valve side. Striae are radiate around the center, 13-15 in 10 µm, becoming parallel then convergent at the apices. The areolae are often visible under LM, ca. 30-32 in 10 μm.

Note that this concept of Navicula germainii follows that of Lange-Bertalot (2001), but differs from the original concept of Wallace (1960), who did not distinguish between N. germainii and N. rostellata sensu Lange-Bertalot. Patrick (Patrick and Reimer 1966) designated a lectotype specimen of Navicula germainii, but Patrick’s circle on holotype slide of N. germainii contains several specimens of both N. germainii and N. rostellata sensu Lange-Bertalot. The illustration of the lectotype in Patrick and Reimer (1966, Fig. 48:8) does not correspond to any of these specimens.

Original Description

Basionym: Navicula germainii
Author: Wallace 1960
Length Range: 34-37 µm
Width Range: 7-9.5 µm
Striae in 10 µm: 13-14

Original Description

Valvis late lanceolatis 34-37 μ longis, 7-9.5 μ latis. Apicibus plus minus porrectis, subcapitatis, striis granulatis, centralibus radiantibus sed apices versus leviter convergentibus, 13-14 in 10 μ.

Original Images

Cite This Page:
Potapova, M. (2011). Navicula germainii . In Diatoms of the United States. Retrieved August 27, 2016, from

Species: Navicula germainii

Contributor: Marina Potapova

Reviewer: Sarah Spaulding


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.

Wallace, J. (1960). New and variable diatoms. Notulae Naturae 331: 1-8.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Navicula germainii CAS

North American Diatom Ecological Database (NADED)

NADED ID: 46616

Autecology Discussion