Eunotia montuosa
Furey, Lowe and Johansen 2011 Category: Eunotioid
BASIONYM: Eunotia montuosa Furey, Lowe and Johansen 2011
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Paula Furey - February 2011
Length Range: 31-59 µm
Width Range: 7-13 µm
Striae in 10 µm: 7-9 in the center valve, 10-14 at the ends
Description
The ventral margin is slightly concave with subapical swellings at the proximal raphe ends. The dorsal margin is strongly biundulate with acutely pointed peaks. The valve apices are constricted, dorsally recurved and apically flattened. Helictoglossae are not visible in the LM. One apical rimoportula is positioned at the center of the apex (visible in SEM). The distal ends of the raphe are slightly curved and clearly visible in the LM. Striae are radiate. Short, radiate striae are present distally to the distal raphe ends. Aerolae within a stria number 24-28 in 10 µm.
Original Description
Basionym: Eunotia montuosa
Author: Furey, Lowe and Johansen 2011
Length Range: 31-59 µm
Width Range: 7-13 µm
Striae in 10 µm: 7-9 in the center valve, 10-14 at the ends, puncta 24-28
Original Description
Valves slightly concave with subapical swellings on the ventral margin, strongly biundulate with acutely pointed peaks on the dorsal margin, 31 – 59 μm long, 7 – 13 μm wide. Ends attenuated, constricted, dorsally recurved, truncated and apically flattened. Helictoglossae not visible in the light microscope. Rimoportula at one end of valve, at the center of the apex. Raphe with distal ends slightly curved and clearly visible in the light microscope. Striae radiate, with abbreviated radial striae at the apices after the last transverse stria, 7 – 9 in 10 μm in the valve center, 10 – 14 in 10 μm near the valve apices. Puncta 24-28 in 10 μm.
Original Images
Cite This Page:
Furey, P. (2011). Eunotia montuosa. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/eunotia_montuosa
Species: Eunotia montuosa
Contributor: Paula Furey
Reviewer: Marina Potapova
Image Credit: Paula Furey
- Dorsal margin biundulate
- Ventral margin concave
- Ends dorsally recurved
- Striae radiate
- Shorter, more radiate striae distal to raphe ends
The dorsal margin is strongly biundulate with two acutely pointed peaks. The ventral margin is slightly concave with subapical swellings. The valve ends are dorsally recurved and apically flattened. Striae are radiate. Shorter, more radiate striae are present distally to the distal raphe ends. The distal raphe is slightly curved and clearly visible in the LM.
Compare
Eunotia montuosa is most similar to E. subherkiniensis. Valves of E. montuosa are larger and broader than E. subherkiniensis (13-30 μm long, 4-8 μm wide) and have more acute dorsal undulations than E. subherkiniensis.
Eunotia subherkiniensis
Kützing
Citations
Furey, P.C., Lowe, R.L. and Johansen, J.R. (2011). Eunotia Ehrenberg (Bacillariophyta) of the Great Smoky Mountains National Park, USA. Bibliotheca Diatomologica 56: 1-134.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
To date, Eunotia montuosa has been found in low abundance in epilithic samples from Hen Wallow Falls and in brown slime on a wet wall at the edge of Meigs Falls in the Great Smoky Mountains National Park.