Navicula angusta
Grunow 1860 Category: Symmetrical biraphid
BASIONYM: Navicula angusta Grunow 1860
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Marina Potapova - February 2011
Length Range: 35-70 µm
Width Range: 6-7 µm
Striae in 10 µm: 11-12
Description
Valves are linear with slightly protracted ends. Axial area is narrow. Central area is moderately asymmetrical, wedge-shaped or irregularly shaped. The central area is larger on the primary side, and semi-elliptical and smaller on the secondary side, but in some specimens it may be nearly symmetrical. Central raphe endings are slightly expanded. Striae are radiate at the central valve, convergent near the apices. Striae are 11-12 in 10 µm. Areolae are lineolate, with approximately 32 in 10 µm.
Original Description
Basionym: Navicula angusta
Author: Grunow 1860
Length Range: 43-51 µm
Width Range: 5.1-5.8 µm
Striae in 10 µm: 12.6
Original Description
Navicula a latere secundo anguste lanceolata, apicibus obsolete productis, nodulo centrali oblongo, striis obscure punctatis radiantibus 32 in 0.001’”. Longitud. 0.0020-0.0017”, latid. 0.0002-0.00023”.
Original Images
Cite This Page:
Potapova, M. (2011). Navicula angusta . In Diatoms of the United States. Retrieved June 20, 2013, from http://westerndiatoms.colorado.edu/taxa/species/navicula_angusta
Species: Navicula angusta
Contributor: Marina Potapova
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves linear
- Valves 6-7 µm wide, 35-70 µm long
- Central area moderately asymmetrical
- Striae radiate at center
- Striae convergent at apices
Valves are linear with slightly protracted ends. The central area is larger on the primary side, and semi-elliptical and smaller on the secondary side, but in some specimens it may be nearly symmetrical. Striae are radiate at the central valve, convergent near apices Striae are 11-12 in 10 µm. Areolae are lineolate, with approximately 32 in 10 µm.
Compare
Navicula angusta differs from other Navicula species by its linear, relatively narrow valves. Larger specimens may be confused with N. radiosa, which has valves that are more lanceolate in shape.
Navicula radiosa
Citations
Grunow, A. (1860). Uber neue oder ungenügend gekannte Algen. Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wein, 10: 503-582.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 46002