Sellaphora rexii

Potapova and Ponader 2008      Category: Symmetrical biraphid
BASIONYM: Sellaphora rexii Potapova and Ponader 2008

Sellaphora pulchra

 

Sellaphora subfasciata

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 September 30, 2014, from http://westerndiatoms.colorado.edu/taxa/species/sellaphora_rexii

Species: Sellaphora rexii

Contributor: Marina Potapova

Reviewer: Sam Rushforth

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)

Sellaphora rexii CAS

North American Diatom Ecological Database (NADED)

NADED ID:

Autecology Discussion