Eunotia orthohedra
Furey, Lowe and Johansen 2011 Category: Eunotioid
BASIONYM: Eunotia orthohedra Furey, Lowe and Johansen 2011
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Paula Furey - February 2011
Length Range: 12-19 µm
Width Range: 2.7-3.8 µm
Striae in 10 µm: 16-20 in the valve center, 20-22 at the ends
Description
The ventral margin is slightly concave and has subapical swellings at the proximal raphe ends. The dorsal margin is flattened with angular shoulders subtending the apices. Valves are narrow, 4.2 – 6.0 times longer than wide. The apices are capitate, dorsally recurved, and rounded. Helictoglossae are not visible in the LM. One apical rimoportula. The raphe is short and curves on to the valve face. The striae are radiate and may be faint in appearance. The areolae are unresolved in the LM.
Original Description
Basionym: Eunotia orthohedra
Author: Furey, Lowe and Johansen 2011
Length Range: 12-19 µm
Width Range: 2.7-3.8 µm
Striae in 10 µm: 16-20 in the center valve, 20-22 at the ends.
Original Description
Valves slightly concave with subapical swellings on the ventral margin at the proximal raphe ends, flattened on the dorsal margin with angular shoulders subtending the apices, narrow, 4.2 – 6.0 times longer than wide, 12 – 19 μm long, 2.7 – 3.8 μm wide. Apices capitate, dorsally recurved, rounded. Helictoglossae not visible in the light microscope. Rimoportula at one end. Raphe short, curved on to valve face. Striae indistinct, radiate, 16 – 20 in 10 μm at the center of the valve, 20 – 22 in 10 μm near the ends. Puncta unresolved in light microscope.
Original Images
Cite This Page:
Furey, P. (2011). Eunotia orthohedra. In Diatoms of the United States. Retrieved May 22, 2013, from http://westerndiatoms.colorado.edu/taxa/species/eunotia_orthohedra
Species: Eunotia orthohedra
Contributor: Paula Furey
Reviewer: Marina Potapova
Image Credit: Paula Furey
- Ventral margin with subapical swellings
- Dorsal margin straight
- Angular shoulders subtending the apices
- Apices capitate, dorsally recurved
- Striae indistinct, radiate
The ventral margin is slightly concave with subapical swellings at the proximal raphe ends. The dorsal margin is flattened with angular shoulders subtending the apices. Valves are narrow and 4.2 – 6.0 times longer than wide. The apices are capitate, dorsally recurved and rounded. The raphe is short and curves on to the valve face. The striae are radiate and may be faint in appearance.
Compare
Eunotia orthohedra belongs to the E. exigua complex, based on size and general features. Eunotia orthohedra is distinct from E. exigua, E. tenella and E. cataractarum, based on the distinct, straight dorsal margin of E. orthohedra.
Eunotia cataractarum
Eunotia exigua
(Bréb.) Rabenhorst
Eunotia tenella
(Grun.) Hustedt
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
Eunotia orthohedra is epilithic and epiphytic on bryophytes in wet walls, creeks, and waterfalls.