Psammothidium levanderi
(Hustedt) Bukhtiyarova and Round 1996 Category: Monoraphid
BASIONYM: Achnanthes levanderi Hustedt 1933
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - August 2010
Length Range: 7-11 µm
Width Range: 4.5-5.2 µm
Striae in 10 µm: 24-30
Description
Valves are elliptical to linear-elliptical. The raphe valve has a linear axial area and a small asymmetric central area. The raphe is straight, without terminal fissures. The central raphe ends curve toward opposite sides internally. The rapheless valve has a rhomboid axial area, which often has an irregular border. The central area on rapheless valve is usually not differentiated from the axial area. Striae are slightly radiate in the center and strongly radiate at the apices of both valves, 24-30 in 10 µm. One row of areolae is present on the mantle of both valves. Areolae are often visible in LM.
Original Description
Basionym: Achnanthes levanderi
Author: Hustedt 1933
Length Range: 6-9 µm
Width Range: 4-5 µm
Striae in 10 µm: 21-23
Original Description
Schalen elliptisch mit breit gerundeten Enden, 6-9 μ lang, 4-5 μ breit. Raphenlose Schalen mit breit lanzettlicher bis elliptischer Axialarea, Transapicalstreifen kurz, radial, 21-23 in 10 μ. Raphenschale mit feiner, fadenförmiger Raphe, Axialarea sehr eng, Zentralarea klein, rundlich bos etwas quer verbreiert, Transapikalstreifen 22-28 in 10 μ, von der Mitte gegen die Enden allmählich enger werdend, leicht radial, sehr zart punktiert.
Original Images
Cite This Page:
Potapova, M. (2010). Psammothidium levanderi. In Diatoms of the United States. Retrieved May 26, 2013, from http://westerndiatoms.colorado.edu/taxa/species/psammothidium_levanderi
Species: Psammothidium levanderi
Contributor: Marina Potapova
Reviewer: Sarah Spaulding
Image Credit: Marina Potapova
- Valves elliptic to linear-elliptic
- Raphe valve with small, asymmetric central area
- Rapheless valve with rhomboid axial area
Valves are elliptical to linear-elliptic. The raphe valve has a linear axial area and a small asymmetric central area. The rapheless valve has a rhomboid axial area, which often has an irregular border. The central area on rapheless valve is usually not differentiated from the axial area. Striae are slightly radiate in the center and strongly radiate at the apices of both valves, 25-31 in 10 µm. Areolae are often visible in LM.
Compare
Psammothidium levanderi differs from P. lacus-vulcani by the shape of the central area on raphe valve. In P. levanderi the central area is asymmetric, but present on both sides of the raphe. In P. lacus-vulcani, the central area is absent from one side of the raphe.
Psammothidium lacus-vulcani
(Lange-Bertalot et Krammer) Bukhtiyarova in Bukhtiyarova & Round
Citations
Bukhtiyarova, L. and Round, F. E. (1996). Revision of the genus Achnanthes sensu lato. Psammothidium, a new genus based on Achnanthidium marginulatum. Diatom Research 11: 1-30.
Hustedt, F. (1933). Die Kieselalgen Deutschlands, Österreichs und der Schweiz unter Berücksichtigung der übrigen Länder Europas sowie der angrenzenden Meeresgebiete. In: L. Rabenhorst (ed.), Kryptogamen Flora von Deutschland, Österreich und der Schweiz. Akademische Verlagsgesellschaft m.b.h. Leipzig, Vol. 7, Part 2, pp. 321-432.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: 186015