Navicula geronimensis
Potapova in Potapova & Charles 2004 Category: Symmetrical biraphid
BASIONYM: Navicula geronimensis Potapova in Potapova & Charles 2004
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Marina Potapova - February 2011
Length Range: 46-50 µm
Width Range: 8-9 µm
Striae in 10 µm: 9-10
Description
Valves are linear-lanceolate. Axial area is narrow. Central area is strongly asymmetrical, wedge-shaped and bordered by irregularly shortened striae at the primary side and semi-lunate in shape on the secondary side. Raphe is almost straight, but slightly shifted towards primary side near the central valve. Proximal raphe ends are slightly expanded and sharply deflected towards the primary side. Terminal raphe fissures are deflected toward the primary side and bifurcate at the valve apices. Striae are radiate in the central part of the valve and parallel near apices. Striae are 9-10 in 10 µm. Areolae are lineolate and number approximately 24-26 in 10 µm.
Original Description
Basionym: Navicula geronimensis
Author: Potapova in Potapova & Charles 2004
Length Range: 46-50 µm
Width Range: 8-9 µm
Striae in 10 µm: 9-10
Original Description
Valves linear-lanceolate, 46-50 µm long, 8-9 µm wide. Raphe almost straight, but near the center slightly bent towards primary side of the valve. Central raphe endings slightly expanded and sharply bent towards primary side. Terminal fissures deflected towards primary side and bifurcate over valve apices. Striae radiate at the middle part of the valve, but parallel near apices, 9-10 in 10 µm. Areolae apically elongate, about 24-26 in 10 µm. Axial area narrow. Central area asymmetrical, bordered by irregularly shortened striae at the primary side, and semi-lunate at the secondary side.
Original Images
Cite This Page:
Potapova, M. (2011). Navicula geronimensis. In Diatoms of the United States. Retrieved May 23, 2013, from http://westerndiatoms.colorado.edu/taxa/species/navicula_geronimensis
Species: Navicula geronimensis
Contributor: Marina Potapova
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves linear-lanceolate
- Central area asymmetrical
- Proximal raphe ends deflected
- Striae radiate at the central valve
Valves are linear-lanceolate. The central area is strongly asymmetrical; wedge-shaped on the primary side and semi-lunate on the secondary side. Striae are radiate in the central part of the valve and parallel near the apices. Striae are 9-10 in 10 µm. Proximal raphe ends are deflected toward the primary side.
Compare
Navicula geronimensis is similar to N. tripunctata in valve size and shape, but can be distinguished by its asymmetrical central area and deflected proximal raphe ends.
Navicula tripunctata
Citations
Potapova, M. and Charles, D.F. (2004). Potential use of rare diatoms as environmental indicators in U.S.A. rivers. In: M. Poulin (ed.), Proceedings of the Seventeenth International Diatom Symposium, Ottawa, Canada, 25th-31st August 2002. Biopress Limited, Bristol, U.K. pp. 281-295.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 46254