Navicula staffordiae

Bahls 2012      Category: Symmetrical biraphid
BASIONYM: Navicula staffordiae Bahls 2012

Navicula sovereignii

 

Navicula streckerae

LM scalebar = 10 µm = 80 pixels.



Observations

Contributor: Loren Bahls - March 2012
Length Range: 17-33 µm
Width Range: 4.7-6.3 µm
Striae in 10 µm: 14-16

Description

Valves are narrowly lanceolate with unprotracted and acutely rounded apices. Raphe branches are filiform with proximal ends deflected slightly to the primary side. Distal raphe fissures are hooked to the secondary side. The axial area is very narrow. The central area is small, elliptic, and asymmetric, and bordered by 1-4 shortened striae. Striae are weakly radiate, becoming convergent toward the apices. Areolae number about 32 in 10 μm and are usually visible in LM.



Original Description

Basionym: Navicula staffordiae
Author: Bahls 2012
Length Range: 17-33 µm
Width Range: 4.7-6.3 µm
Striae in 10 µm: 14-16

Original Description

Valves are narrowly lanceolate with acutely rounded ends, 17–33 μm long, 4.7– 6.3 μm wide. Raphe filiform, proximal endings defl ected to the primary side, distal raphe fissures hooked to the secondary side. Axial area very narrow, central area small and asymmetric. Striae radiate, abruptly becoming convergent toward the ends, 14 –16 in 10 μm, lineolae about 32 in 10 μm, visible in LM. For measurements, n = 32 valves. SEM (Figs 26 – 28): External raphe fissures filiform, proximal endings deflected slightly to the primary side. Distal raphe endings hooked, the hooks opening toward the secondary side (the side with the Voigt faults). Other features unremarkable.

Original Images


Cite This Page:
Bahls, L. (2012). Navicula staffordiae. In Diatoms of the United States. Retrieved November 22, 2014, from http://westerndiatoms.colorado.edu/taxa/species/navicula_staffordiae

Species: Navicula staffordiae

Contributor: Loren Bahls

Reviewer: Mark Edlund

Citations

Bahls, L.L. (2012). Seven new species in Navicula sensu stricto from the Northern Great Plains and Northern Rocky Mountains. Nova Hedwigia, Beiheft 141: 19–38.

Links & ID's

Index Nominum Algarum (INA)

California Academy of Sciences (CAS)

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion

Navicula staffordiae is known only from Sand Creek, Garfield County, Montana. The following water quality variables were measured at this location on the sampling date: pH 8.85, specific conductance 1756 μS/cm, total phosphorus 0.447 mg/L, orthophosphate 0.010 mg/L, total nitrogen 3.037 mg/L, dissolved oxygen 6.57 mg/L, temperature 21.8 °C.