Lange-Bertalot in Witkowski, Lange-Bertalot & Stachura 1998 Category: Symmetrical biraphid
BASIONYM: Navicula vaneei Lange-Bertalot in Witkowski, Lange-Bertalot & Stachura 1998
Contributor: Loren Bahls - November 2011
Length Range: 40-60 µm
Width Range: 11.1-12.1 µm
Striae in 10 µm: 8-9
Valves are lanceolate with rather narrow, obtusely rounded ends that are slightly protracted. The axial area is narrow, widening slightly near the transverse, irregular central area. The raphe is moderately lateral, with inflated proximal ends that are deflected slightly toward the primary side. Striae are radiate and more widely spaced in the central area, becoming convergent at the ends. Areolae are coarse, consistently numbering 20 in 10 µm.
Basionym: Navicula vaneei
Author: Lange-Bertalot in Witkowski, Lange-Bertalot & Stachura 1998
Length Range: 40-80 µm
Width Range: 11-13 µm
Striae in 10 µm: 8-10
Valves lanceolate with ends which are regularly not protracted or exceptionally indistinctly protracted, apices obtusely rounded, 40-80 microns long, 11-13 microns broad. Raphe fissures moderately lateral with coarsely marked central pores. Axial area linear and moderately narrow, central area distinctly asymmetric, transversely rectangular to elliptic. Transapical sstriae radiate, convergent at the apices, 8-10 in 10 microns. Lineolae comparatively coarse, 20-24 in 10 microns. SEM: The large central pores with short, hook-like processes are similar to N. peregrina.
Lange-Bertalot, H. (2001). Navicula sensu stricto, 10 genera separated from Navicula sensu lato, Frustulia. Diatoms of Europe 2: 1-526.
Witkowski, A., Lange-Bertalot, H. and Stachura, K. (1998). New and confused species in the genus Navicula (Bacillariophyceae) and the consequences of restrictive generic circumscription. Cryptogamie Algol. 19: 83-108.
There are four records of Navicula vaneei in the Montana Diatom Collection, from Freshwater Creek in California and Big Sandy and Squirrel Creeks in Montana. Concurrent water chemistry data for these samples suggest that N. vaneei prefers fresh calcium-bicarbonate waters of moderate conductivity. Lange-Bertalot (2001) reports Navicula vaneei from Europe and northwestern Siberia, where it prefers waters with average to high electrolyte content. Common diatom associates of N. vaneei in the western U.S. include Psammothidium ventralis, Navicula integra, Diploneis subovalis, Nitzschia valdecostata, Tryblionella littoralis, Nitzschia tubicola, Cymbella aspera, Placoneis constans, Planothidium engelbrechtii, Navicula streckerae, Navicula pseudotenelloides, Denticula subtilis, Stauroneis phoenicenteron, Cylindrotheca closterium, Karayevia oblongella, Anomoeoneis sphaerophora, and Navicula peregrina.