Sellaphora wallacei
(Reimer) Potapova and Ponader 2008 Category: Symmetrical biraphid
BASIONYM: Navicula wallacei Reimer 1966
LM scalebar = 10 µm = 80 pixels.
Observations
Contributor: Marina Potapova - August 2011
Length Range: 16-26 µm
Width Range: 4.1-4.7 µm
Striae in 10 µm: 40-48
Description
Valves are linear with rostrate to subcapitate ends. The axial area is narrow and slightly elevated, with shallow grooves on both sides of the raphe. The central area is very small. The raphe is filiform, with proximal ends slightly deflected to the same side and terminal fissures curved to the opposite side. Striae are radiate and only distinguishable near the central area. Polar bars are present at the apices.
Original Description
Basionym: Navicula wallacei
Author: Reimer 1966
Length Range: 17-27 µm
Width Range: 4-4.5 µm
Striae in 10 µm: 30-32 in the center valve
Original Description
Valves linear with convex sides and slightly constricted, broadly rostrate ends. Axial area narrow, linear, bordered by narrow siliceous rib. Central area very small, unilateral. Raphe broadening toward valve center. Proximal raphe ends deflected in the same direction; distal ends deflected in the same direction, which is opposite the curvature of the proximal ends. Striae radiate, visible in central portion of valve only. A few short striae interposed at mid-valve. Siliceous thickenings ("caps") present near each end on either side of axial area. Length 17-27 µ. Breadth 4-4.5 µ. Striae 30-32 in 10 µ at center, otherwise unresolved.
Original Images
Cite This Page:
Potapova, M. (2011). Sellaphora wallacei . In Diatoms of the United States. Retrieved May 19, 2013, from http://westerndiatoms.colorado.edu/taxa/species/sellaphora_wallacei
Species: Sellaphora wallacei
Contributor: Marina Potapova
Reviewer: Rex Lowe
Image Credit: Marina Potapova
- Valves linear
- Striae mostly invisible under LM
- Central area small
- Polar bars present
Valves are linear with rostrate to subcapitate ends. Valves are 4.1-4.7 µm wide. The central area is very small. Striae are radiate, only distinguishable near the central area. Polar bars are present at the apices.
Compare
Sellaphora wallacei frequently co-occurs with Fallacia latelongitudinalis, which is somewhat similar in size and also has extremely fine striae. Unlike S. wallacei, F. latelongitudinalis has a conopeum covering external valve surface and whihc gives the appearance of "wrinkles" alongside the raphe. The valve apices of S. wallacei are drawn-out, while they are not set-off in F. latelongitudinalis.
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Fallacia latelongitudinalis
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.
Reimer, C.W. . (1966). Consideration of fifteen diatom taxa (Bacillariophyta) from the Savannah River, including seven described as new. Notulae Naturae (Academy of Natural Sciences of Philadelphia) 397:1-15.
Links & ID's
Index Nominum Algarum (INA)
California Academy of Sciences (CAS)
North American Diatom Ecological Database (NADED)
NADED ID: