Eunotia trinacria
Krasske 1929 Category: Eunotioid
BASIONYM: Eunotia trinacria Krasske 1929
SYNONYM(S): Eunotia paludosa var. trinacria (Krasske) Nörpel and Alles in Alles et al. 1991
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Paula Furey - March 2012
Length Range: 8-24 µm
Width Range: 1.7-2.6 µm
Striae in 10 µm: 17-23 in the center valve
Description
Valves are elongate-triangular, becoming more linear in larger specimens. Ventral margins are straight to weakly concave. Dorsal margins are slightly convex, with a slight central undulation. Valve ends are weakly subcapitate, subrostrate and not set off, or only slightly set off, from the main part of the valve. Helitoglossae are located close to the apices. Striae are parallel. The areolae are unresolved in the LM. Frustules are rectangular in girdle view.
Original Description
Basionym: Eunotia trinacria
Author: Krasske 1929
Length Range: 4-10 µm
Width Range: 2-4 µm
Striae in 10 µm: 17-22
Original Description
Original Images
Cite This Page:
Furey, P. (2012). Eunotia trinacria. In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/eunotia_trinacria
Species: Eunotia trinacria
Contributor: Paula Furey
Reviewer: Marina Potapova
Image Credit: Paula Furey
- Valves elongate triangular
- Ventral margin straight to weakly concave
- Dorsal margin with slight central undulation
Valves are elongate-triangular, becoming more linear in larger specimens. Ventral margins are straight to weakly concave. Dorsal margins are slightly convex, with a slight central undulation. Valve ends are weakly subcapitate, subrostrate and not off, or only slightly set off, from the main part of the valve.
Compare
The morphology of E. trinacria is most similar to E. microcephala and E. rushforthii. The central undulation on the dorsal margin of E. trinacria is less prominent than that of E. microcephala and slightly more prominent than that of E. rushforthii. The ventral margin of E. microcephala has two weak undulations that are less prominent or absent from valves of E. trinacria. Valves of E. trinacria are narrower than valves of E. rushforthii.
Eunotia microcephala
Eunotia rushforthii
Citations
Alles, E., Nörpel-Schempp, M. and Lange-Bertalot, H. (1991). Taxonomy and ecology of characteristic Eunotia species in headwaters with low electric conductivity. Nova Hedwigia. 53: 171-213.
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.
Krammer, K. and Lange-Bertalot, H. (1991). Bacillariophyceae. 3. Teil: Centrales, Fragilariaceae, Eunotiaceae. . In Ettl, H., Gerloff, J., Heynig, H. & Mollenhauer, D. (Eds.). Süsswasserflora von Mitteleuropa. 2(3): 1-576. Gustav Fisher Verlag, Stuttgart, Germany.
Krasske, G. (1929). Beiträge zur Kenntnis der Diatomeenflora Sachsens. Botanisches Archiv 27(3/4): 348-380.
Lange-Bertalot, H., Bak, M., Witkowski, A. and Tagliaventi, N. (2011). Eunotia and some related genera. Diatoms of the European Inland Waters and Comparable Habitats. 6: 747 pp.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 33212
Autecology Discussion
Found in streams, wetwalls, waterfalls, and sink holes, often associated with bryophytes.