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Sellaphora californica

Potapova in Potapova and Charles 2004      Category: Symmetrical biraphid

Sellaphora bacillum


Sellaphora fusticulus

LM scalebar = 10 µm = 80 pixels.


Contributor: Marina Potapova - March 2011
Length Range: 23-40 µm
Width Range: 8-10 µm
Striae in 10 µm: 20-22 in the center valve, 26-28 at the ends


Valves are elliptic with rostrate apices. Raphe branches have a single groove at either side. The grooves are covered externally by non-porous conopea. Grooves and conopea are interrupted by central area. The raphe is straight with expanded external central raphe ends and terminal fissures deflected toward the secondary side. Striae are strongly radiate, becoming convergent near the apices. The central area is transverse, bow-tie-shaped and bordered by irregularly shortened striae.

Original Description

Author: Potapova 2004
Length Range: 23-40 µm
Width Range: 8-10 µm
Striae in 10 µm: 20-22

Original Description

Valvae ellipticae, apicibus late rostratis, 23-40 μm longae, 8-10 μm latae. Sulci utroque fissurae raphis latere, conopeis non porosis. Sulci et conopea area centralis interruptis. Raphe recta, extremis centralibus dilatatis, fussurae terminales deflectis ad latus secundum valvae. Striae valde radiantes, convergentes ad apices. Striae 20-22 in 10 μm in pars centralis, prope apicem 26-28 in 10 μm. Area centralis fasciam latam formans conspicue dilatata ad margines versus, ibi plerumque cum striis irregulariter abbreviatis. Valves elliptical with broadly rostrate apices, 23-40 μm long, 8-10 μm wide. Raphe branches with one groove at either side. Grooves covered externally by non-porous conopeum. Grooves and conopea interrupted by central area. Raphe straight with expanded central external endings and terminal fissures deflected towards secondary side of the valve. Striae strongly radiate, becoming convergent near apices. Striae 20-22 in 10 μm in the central part, 26-28 in 10 μm towards the ends. Central area transverse, bow-tie-shaped, bordered by irregularly shortened striae.

Original Images

Cite This Page:
Potapova, M. (2011). Sellaphora californica. In Diatoms of the United States. Retrieved May 23, 2018, from

Species: Sellaphora californica

Contributor: Marina Potapova

Reviewer: Sam Rushforth


Potapova, M. and Charles, D.F. (2004). Potential use of rare diatoms as environmental indicators in U.S.A. rivers. In: M. Poulin (ed.), Proceedings of the Seventeenth International Diatom Symposium, Ottawa, Canada, 25th-31st August 2002. Biopress Limited, Bristol, U.K. pp. 281-295.

Links & ID's

Index Nominum Algarum (INA)

Original INA

California Academy of Sciences (CAS)

Sellaphora californica CAS

North American Diatom Ecological Database (NADED)


Autecology Discussion