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Gyrosigma rautenbachiae Cholnoky

Classification:
Empire Eukaryota
Kingdom Chromista
Phylum Bacillariophyta
Subphylum Bacillariophytina
Class Bacillariophyceae
Subclass Bacillariophycidae
Order Naviculales
Suborder Naviculineae
Family Naviculaceae
Genus Gyrosigma

Pictures

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Gyrosigma rautenbachiae Cholnoky
LM. 17 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma rautenbachiae Cholnoky
LM. 17 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma rautenbachiae Cholnoky
SEM. 17 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma rautenbachiae Cholnoky
SEM. 17 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma rautenbachiae Cholnoky
LM. 17 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

 

Gelidium crinale var. polycladum (Kützing) Hauck

Gyrosigma rautenbachiae Cholnoky LM
© F.A.S. Sterrenburg

Publication details
Gyrosigma rautenbachiae Cholnoky 1957: 65, fig. 61 (as 'Rautenbachiae' )

Published in: Cholnoky, B.J. (1957). Beiträge zur Kenntnis der Südafrikanischen Diatomeenflora. Portugaliae Acta Biologica, Séries B, 6(1): 53-93.

Type species
The type species (holotype) of the genus Gyrosigma is Gyrosigma hippocampus Hassall.

Status of name
This name is of an entity that is currently accepted taxonomically.

Synonym(s)
No synonyms are currently included in AlgaeBase.

General environment
No habitat entry has yet been made for this entity.

Description
Valve lanceolate with relatively broad apices, 120-200 µm long, 18-30 µm wide. Raphe sternum ± median, central area small, oval. This species is very similar to Gy. acuminatum except that the striation is coarser in Gy. rautenbachiae  circa 14-16 in 10 µm, with the longitudinal striae very slightly finer than the transverse. The central raphe fissures of Gy. rautenbachiae cross the striae, which has never been seen in Gy. acuminatum. This can often just be observed in the LM. However, the apical structure of Gy. rautenbachiae is totally different from that of Gy. acuminatum: one row of areolae runs around the apex (which is not the case in Gy. acuminatum) and is paralleled by a very long row of microforamina. The latter can just be seen in the LM if the valve is favourably oriented but is immediately evident in SEM. The long row of areolae that runs around the apex is clearly visible in the LM, however.

Similar species
The species may have been confused with Gy. acuminatum and its distribution may not be limited to South Africa.

Detailed distribution with sources (Click to Load)

Key references
Schoeman, F.R. & Archibald, R.E.M. (1986). Gyrosigma rautenbachiae Cholnoky (Bacillariophyceae): its morphology and taxonomy. Nova Hedwigia 43: 129-157.

Sterrenburg, F.A.S. (1995). Studies on the genera Gyrosigma and Pleurosigma (Bacillariophyceae). Gyrosigma acuminatum (Kützing) Rabenhorst, G. spenceri (Quekett) Griffith et Henfrey and G. rautenbachiae Cholnoky. Proceedings Academy of Natural Sciences of Philadelphia 146: 467-480.

Created: 17 July 2011 by M.D. Guiry

Verified by: 17 July 2011 by M.D. Guiry

Accesses: This record has been accessed by users 562 times since it was created.

Verification of data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

References
(Please note: only references with the binomials in the title are included. The information is from the Literature database.)

Schoeman, F.R. & Archibald, R.E.M. (1986). Gyrosigma rautenbachiae Cholnoky (Bacillariophyceae): its morphology and taxonomy. Nova Hedwigia 43: 129-157.
Sterrenburg, F.A.S. (1995). Studies on the genera Gyrosigma and Pleurosigma (Bacillariophyceae). Gyrosigma acuminatum (Kützing) Rabenhorst, G. spenceri (Quekett) Griffith et Henfrey and G. rautenbachiae Cholnoky. Proceedings Academy of Natural Sciences of Philadelphia 146: 467-480.

Linking to this page: http://www.algaebase.org/search/species/detail/?species_id=139596

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2018. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 25 September 2018.

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