Sellaphora meridionalis
Potapova and Ponader 2008 Category: Symmetrical biraphid
BASIONYM: Sellaphora meridionalis Potapova and Ponader 2008
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - February 2013
Length Range: 18-32 µm
Width Range: 6.8–7.8 µm
Striae in 10 µm: 22–23
Description
Valves are elliptic, with broadly rounded ends that are only very slightly protracted. The axial area is narrow and straight. The central area is bow-tie-shaped and relatively small. The center area is bounded by alternating short and long striae. The striae are radiate throughout most of the valve, becoming parallel or slightly convergent at the ends. The areolae are small, round and number approximately 50 in 10 μm. At the valve ends, the striae are interrupted and internally form “polar bars,” a feature visible in LM. The raphe is straight, with proximal ends externally slightly bent toward the primary side of the valve. The external surface of the valve face is smooth, without visible grooves or conopea.
Original Description
Basionym: Sellaphora meridionalis
Author: Potapova and Ponader 2008
Length Range: 18–32 µm
Width Range: 6.8–7.8 µm
Striae in 10 µm: 22–23
Original Description
Valves are 6.8–7.8 μm wide, 18–32 μm long, elliptical, with broadly rounded and only very slightly protracted ends (Fig. 2). The axial area is narrow and straight. The central area is bow-tie-shaped, with alternating short and long striae, relatively small. The uniseriate striae are radiate throughout most of the valve, and parallel or slightly convergent at the ends; striae density is 22–23 in 10 μm. The areolae are small, rounded, approximately 50 in 10 μm transapically. At the valve ends the striae are interrupted and internally form “polar bars,” which are visible on LM photographs (Figs 2A-I). The raphe is straight, with central endings externally slightly bent towards the primary side of the valve (Figs 2K, L), and terminal fissures curved towards secondary side of the valve (Figs 2J, L). The external surface of the valve face is smooth without visible grooves or conopea often present in Sellaphora.
Original Images
Cite This Page:
Potapova, M. (2013). Sellaphora meridionalis . In Diatoms of the United States. Retrieved May 21, 2013, from http://westerndiatoms.colorado.edu/taxa/species/sellaphora_meridionalis
Species: Sellaphora meridionalis
Contributor: Marina Potapova
Reviewer: Sam Rushforth
Image Credit: Marina Potapova
- Valves elliptic
- Central area bow-tie shaped
- Polar bars present
Valves are elliptic, with broadly rounded ends that are only very slightly protracted. The central area is bow-tie shaped, bordered alternating short and long striae. At the valve ends, polar bars present. The external surface of the valve face is smooth, without visible grooves or conopea.
Compare
Sellaphora meridionalis is elliptical in shape, especially as compared to S. pupula, which has more broadly rounded apices. Sellaphora rexii possesses grooves and conopea, while they are absent in S. meridionalis.
Sellaphora rexii
Sellaphora pupula
(Kützing) Meresckowsky
Citations
Potapova, M. and Ponader, K.C. (2008). New species and combinations in the diatom genus Sellaphora (Sellaphoraceae) from southeastern United States. Harvard Papers in Botany 13: 171-181.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: