Eunotia bilii
Lowe and Kociolek 1984 Category: Eunotioid
BASIONYM: Eunotia bilii Lowe and Kociolek 1984
LM scalebar = 10 µm = 40 pixels.
Observations
Contributor: Paula Furey - April 2011
Length Range: 29-50 µm
Width Range: 10-13 µm
Striae in 10 µm: 7-10 in the center valve, 10-16 at the ends
Description
Valves are highly arched. The dorsal margin is undulate . The number of dorsal undulations and their depth is variable within the species , but generally ranges from 5 to 8. The ventral margin is straight or slightly concave. The apices are protracted and terminate bluntly, with a slight ventral curvature. Two types of striae are present; full striae are widely spaced and extend from margin to margin, irregular striae are very short and restricted to the dorsal margin near the center valve. Shortened striae are absent from the valve apices. Valves possess one apical rimoportula. Internally, the openings of the areolae are aligned in the bottom of a narrow groove in the inner valve surface (SEM).
Original Description
Basionym: Eunotia bilii
Author: Lowe and Kociolek 1984
Length Range: 32-46 µm
Width Range: 10-13 µm
Striae in 10 µm: 9-10
Original Description
Valves highly arched, dorsal margin undulate, with number and depth of undulations variable. Ventral margin straight or slightly concave. Valve length: 32-46 μm, breadth 10-13 μm. Ends protracted but terminating bluntly, with a slight ventral curvature at the ends. Full striae widely spaced, with irregular shortened striae at the dorsal margin near mid-valve. Shortened striae not present at valve ends. Number of striae 9-10 μm.
Original Images
Cite This Page:
Furey, P. (2011). Eunotia bilii. In Diatoms of the United States. Retrieved May 21, 2013, from http://westerndiatoms.colorado.edu/taxa/species/eunotia_bilii
Species: Eunotia bilii
Contributor: Paula Furey
Reviewer: Sam Rushforth
Image Credit: Paula Furey
- Dorsal margin undulate
- Apices terminate bluntly
- Striae on dorsal margin short and irregular
The dorsal margin with 5 to 8 undulations. The ventral margin is straight or slightly concave. The ends are protracted but terminate bluntly, with a slight ventral curvature at the ends. Irregular, shortened striae are present on the dorsal margin near the center valve.
Compare
The highly arched dorsal margin and irregular shortened striae of E. bilii valves distinguish it from E. hexaglyphis. The absence of fine radiate striae near the ends in E. bilii distinguish it from E. subpolyglyphus.
Eunotia hexaglyphis
Ehrenberg
Eunotia subpolyglyphis
Krasske
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.
Lowe, R.L. and Kociolek, J.P. (1984). New and rare diatoms from Great Smoky Mountains National Park. Nova Hedwigia 39(3-4): 465-476.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID:
Autecology Discussion
Eunotia bilii is found epiphytic on bryophytes, in first through fourth order streams and wet walls, especially throughout the Great Smoky Mountains National Park.
Images
Eunotia bilii has been collected from rivers such as this in the Great Smoky Mountains National Park: Hazel Creek.
Credit/Source: Linda Novitski
Eunotia bilii has been collected from rivers such as this in the Great Smoky Mountains National Park: Otter Creek.
Credit/Source: Paula C. Furey
Eunotia bilii has been collected from wet walls such as this. Chimney Tops Trail, Great Smoky Mountains National Park.
Credit/Source: Paula C. Furey