Rhopalodia gibba
(Ehrenberg) O. Müller 1895 Category: Epithemioid
BASIONYM: Navicula gibba Ehrenberg 1830
LM scalebar = 10 µm = 20 pixels.
Observations
Contributor: Pat Kociolek - March 2011
Length Range: 75-205 µm
Width Range: 8-11 µm
Striae in 10 µm: 12-16
Description
Valves usually seen in girdle view. Valves are linear, with apices bent towards the ventral margin. The central valve is inflated, often with a visible "notch" on the dorsal margin. The raphe is positioned in a canal along the dorsal margin, and the proximal raphe ends and helictoglossae are not evident. Costae are prominent, and extend across the valve face. Between each costa are between 2 and 3 rows of singly punctate striae. Costae number 5-8 in 10 µm.
This species is usually an epiphyte, but may also be found in the benthos. Both Patrick & Reimer (1966) and Krammer and Lange-Bertalot (1988) give dimensions of up to 300 µm in length.
Original Description
Basionym: Navicula gibba
Author: Ehrenberg 1830
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Kociolek, P. (2011). Rhopalodia gibba. In Diatoms of the United States. Retrieved May 22, 2013, from http://westerndiatoms.colorado.edu/taxa/species/rhopalodia_gibba
Species: Rhopalodia gibba
Contributor: Pat Kociolek
Reviewer: Rex Lowe
Image Credit: Pat Kociolek
- Valves linear
- Valves large
Valves linear, with apices bent towards the ventral margin. The center is deflected slightly towards the dorsal margin and notched. The raphe is positioned in a canal. Costae are prominent, and extend across the valve face.
Compare
This species is distinguished from other members of the genus by its linear shape, long valves and striae composed of single rows of puncta.
Citations
Krammer, K. and Lange-Bertalot, H. (1988). Bacillariophyceae. 2. Teil: Bacillariaceae, Epithemiaceae, Surirellaceae. In: Ettl, H., J. Gerloff, H. Heynig and D. Mollenhauer (eds.) Susswasserflora von Mitteleuropa, Band 2/2. Gustav Fisher Verlag, Jena.
Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 58001