Navicula sovereignii

Bahls 2011      Category: Symmetrical biraphid
BASIONYM: Navicula sovereignii Bahls 2011

REPORTED AS: Navicula aurora (Bahls 2005) 

Navicula slesvicensis

 

Navicula staffordiae

LM scalebar = 10 µm = 40 pixels.



Observations

Contributor: Loren Bahls - November 2011
Length Range: 52-87 µm
Width Range: 12.8-16.5 µm
Striae in 10 µm: 8-10

Description

Valves are elliptical to lanceolate with obtuse, broadly rounded, sub-protracted ends. The axial area is narrow, linear, widening slightly near the central area. The central area is rounded with irregular margins. Axial and central areas have vermiform markings. Raphe branches are lateral and outer raphe fissures are somewhat bowed, concave to the primary side. Proximal raphe ends are bulbous and laterally expanded, the larger part on the secondary side of the valve. Striae are radiate, becoming parallel at the ends and alternately longer and shorter about the central area. Areolae are fine and number 26-28 in 10 µm.



Original Description

Basionym: Navicula sovereignii
Author: Bahls 2011
Length Range: 52-87 µm
Width Range: 12.8-16.5 µm
Striae in 10 µm: 8-10

Original Description

Valves lanceolate with obtuse, broadly rounded, sub-protracted ends. Length 52-87 μm, width 12.8-16.5 μm. Axial area narrow, linear, widening slightly near the central area. Central area rounded with irregular margins. Axial and central areas have a vermiform pattern. Raphe lateral, outer raphe fissure somewhat bowed, concave to the primary side. Terminal raphe endings hooked, hooks opening toward the secondary side. Proximal pores large, hammer-head shaped and deflected at right angles toward the secondary side. Striae radiate, becoming parallel at the ends, alternately longer and shorter about the central area, 8-10 in 10 μm. Areolae fine, 26-28 in 10 μm.

Original Images


Cite This Page:
Bahls, L. (2011). Navicula sovereignii. In Diatoms of the United States. Retrieved September 17, 2014, from http://westerndiatoms.colorado.edu/taxa/species/navicula_sovereignii

Species: Navicula sovereignii

Contributor: Loren Bahls

Reviewer: Sarah Spaulding

Citations

Bahls, L. (2005). Northwest Diatoms: a photographic catalogue of species in the Montana Diatom Collection, with ecological optima, associates, and distribution records for the nine northwestern United States. Northwest Diatoms, Volume 2. The Montana Diatom Collection, Helena, 464 pp.

Bahls, L.L. (2011). Three new species of Navicula (Bacillariophyta) from Oregon and Montana and a review of diatom endemism in the Northwest. Northwest Science 85 (4): 517-526.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Besides the type locality in eastern Oregon, there are three records of Navicula sovereignii in the Montana Diatom Collection from streams in the Cascade Mountains of western Oregon, where pH is circumneutral (range = 6.7-7.6) and conductance is very low (range = 27-53 µS/cm).

Images

Steens Mountain, Harney County, Eastern Oregon. The type locality for Navicula sovereignii is a spring creek on the western slope of Steens Mountain.

Credit/Source: Loren Bahls.