Nupela impexiformis
(Lange-Bertalot in Lange-Bertalot and Krammer) Lange-Bertalot 1999 Category: Symmetrical biraphid
BASIONYM: Achnanthes impexiformis Lange-Bertalot in Lange-Bertalot and Krammer 1989
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - March 2011
Length Range: 14-17 µm
Width Range: 3.8-4.6 µm
Striae in 10 µm: 44-50
Description
Valves are elliptical-lanceolate with capitate ends. Striae are radiate, rarely discernible in LM. Axial area is linear-lanceolate. Central area is large, asymmetrical, reaching valve margin on one side of the valve. The raphe is absent on one of the valves. The raphe is straight. External proximal raphe ends are simple or slightly expanded.
Original Description
Basionym: Achnanthes impexiformis
Author: Lange-Bertalot in Lange-Bertalot and Krammer 1989
Length Range: 12-16 µm
Width Range: 3.5-4.5 µm
Striae in 10 µm: 45-55
Original Description
Original Images
Cite This Page:
Potapova, M. (2011). Nupela impexiformis . In Diatoms of the United States. Retrieved May 18, 2013, from http://westerndiatoms.colorado.edu/taxa/species/nupela_impexiformis
Species: Nupela impexiformis
Contributor: Marina Potapova
Reviewer: Sam Rushforth
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves elliptical-lanceolate with capitate ends
- Raphe absent on one valve
- Central area strongly asymmetrical
- Striae not visible in LM
Valves are elliptical-lanceolate with capitate ends. Striae are radiate, rarely discernible in LM. Central area is large, asymmetrical, reaching valve margin on one side of the valve. The raphe is absent on one of the valves.
Compare
Nupela impexiformis differs from N. wellneri by more capitate ends, asymmetrical central area, and absence of raphe on one valve.
Nupela wellneri
Citations
Lange-Bertalot, H. (1999). Neue Kombinationen von taxa aus Achnanthes Bory (sensu lato). Iconographia Diatomologica 6: 276-289.
Lange-Bertalot, H. and Krammer, K. (1989). Achnanthes eine Monographie der Gattung mit Definition der Gattung Cocconeis and Nachtragen zu den Naviculaceae. Bibliotheca Diatomologica 18, 393 pp. Cramer, Berlin, Stuttgart.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 92015