Sellaphora rexii
Potapova and Ponader 2008 Category: Symmetrical biraphid
BASIONYM: Sellaphora rexii Potapova and Ponader 2008
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - December 2010
Length Range: 22-33 µm
Width Range: 7.1-8.6 µm
Striae in 10 µm: 20-24
Description
Valves are elliptic with subrostrate apices. The axial area is linear, formed by grooves, one at each side of the raphe. Grooves are approximately 0.5 μm wide and covered externally by non-porous conopeum. Grooves and conopea are interrupted by the central area, which is transversely rectangular, or bow-tie-shaped and bordered by striae of an irregular length. The striae are uniseriate, radiate throughout most of the valve, but parallel or convergent near the apices. Near the valve ends, the striae are interrupted and internally form “polar bars”, which are visible in LM. The areolae are small, rounded, approximately 50-55 in 10 μm. The raphe is straight, with expanded central endings.
Original Description
Basionym: Sellaphora rexii
Author: Potapova and Ponader 2008
Length Range: 22-33 µm
Width Range: 7.1-8.6 µm
Striae in 10 µm: 20-24
Original Description
Valves are elliptical, with subrostrate apices. 22-33 μm long, 7.1-8.6 μm wide (Fig. 4). The axial area is straight, formed by grooves, one at each side of the raphe. Grooves are approximately 0.5 μm wide and covered externally by non-porous conopeum (Fig. 4E). Grooves and conopea are interrupted by the central area, which is transversely rectangular, or bow-tie-shaped and bordered by striae of an irregular length. The striae are uniseriate, radiate throughout most of the valve, but parallel or convergent near the apices, 20-24 in 10 μm. Near the valve ends, the striae are interrupted and internally form “polar bars” which are visible on LM photographs (Fig. 4A-D). The areolae are small, rounded, approximately 50-55 in 10 μm. The raphe is straight, with expanded central endings, and terminal fissures curved to the secondary side of the valve.
Original Images
Cite This Page:
Potapova, M. (2010). Sellaphora rexii. In Diatoms of the United States. Retrieved August 23, 2017, from http://westerndiatoms.colorado.edu/taxa/species/sellaphora_rexii
Species: Sellaphora rexii
Contributor: Marina Potapova
Reviewer: Sam Rushforth
Image Credit: Marina Potapova
- Valves elliptic with subrostrate apices
- Grooves along each side of raphe 0.5 μm wide
- Grooves covered by conopea
- Central area transversely rectangular or bow-tie shaped
Valves are elliptic, with subrostrate apices. Valves are 22-33 μm long and 7.1-8.6 μm wide. The axial area is linear, formed by grooves, one at each side of the raphe. Grooves are approximately 0.5 μm wide and covered externally by non-porous conopeum. Grooves and conopea are interrupted by the central area, which is transversely rectangular, or bow-tie-shaped and bordered by striae of an irregular length. Polar bars are present.
Compare
Sellaphora californica and S. hohnii have wider valves, grooves and conopea than S. rexii. Sellaphora mutatoides has more narrow apices. Sellaphora meridionalis lacks grooves and conopea.
Sellaphora californica
Sellaphora hohnii
Sellaphora meridionalis
Sellaphora mutatoides
Lange-Bertalot and Metzeltin
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: