Mastogloia smithii var. lacustris
Grunow 1878 Category: Symmetrical biraphid
BASIONYM: Mastogloia smithii var. lacustris Grunow 1878
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Pat Kociolek - March 2011
Length Range: 30-54 µm
Width Range: 8-10 µm
Striae in 10 µm: 15-17
Description
Valves are linear-lanceolate with margins slightly convex to nearly straight and apices bluntly produced. The axial area is straight, narrow and expanded to form an asymmetric, elliptic to nearly rectangular central area. The raphe is straight and filiform, becoming lateral at about ½ the way between the apex and central area. External proximal raphe ends are enlarged. Striae are distinctly punctate and radiate, except at the apices where they are parallel.
Co-occurs with the nominate variety in alkaline, lentic habitats.
Original Description
Basionym: Mastogloia smithii var. lacustris
Author: Grunow 1878
Length Range: µm
Striae in 10 µm:
Original Description
Original Images
Cite This Page:
Kociolek, P. (2011). Mastogloia smithii . In Diatoms of the United States. Retrieved May 25, 2013, from http://westerndiatoms.colorado.edu/taxa/species/mastogloia_smithii_var._lacustris
Species: Mastogloia smithii
Contributor: Pat Kociolek
Reviewer: Sarah Spaulding
Image Credit: Pat Kociolek
- Valves linear-lanceolate
- External proximal raphe ends enlarged
- Width 8-10 µm
Valves linear-lanceolate, with margins slightly convex to nearly straight. The apices are bluntly produced. The raphe is straight and filiform, becoming lateral at about ½ the way between the apex and central area. The proximal raphe ends are enlarged. Striae are distinctly punctate and radiate, except at the apices where they are parallel.
Compare
Mastogloia smithii var. lacustris is distinguished from the nominate variety by the much more slender valve shape and structure of the proximal raphe ends, which are more greatly enlarged in this variety.
Mastogloia smithii
Citations
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
Mastogloia smithii var. lacustris CAS
North American Diatom Ecological Database (NADED)
NADED ID: 43004