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Gyrosigma scalprum (Gaillon) Sterrenburg

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

Pictures

click on thumbnail for larger version.

Gyrosigma scalprum (Gaillon) Sterrenburg
Essex coast, UK. 16 Sep 2013. Wulf Herwig. © Wulf Herwig (WEHerwig@arcor.de).

Gyrosigma scalprum (Gaillon) Sterrenburg
02 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma scalprum (Gaillon) Sterrenburg
02 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma scalprum (Gaillon) Sterrenburg
02 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma scalprum (Gaillon) Sterrenburg
02 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma scalprum (Gaillon) Sterrenburg
02 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma scalprum (Gaillon) Sterrenburg
02 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

 

Publication details
Gyrosigma scalprum (Gaillon) Sterrenburg 2007: 495

Published in: Sterrenburg, F.A.S. (2007). Basionym of Gyrosigma scalprum. Diatom Research 22(2): 495.

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.

Basionym
Navicula scalprum Gaillon

Type information
Type locality: France: "bassins dans les ports de mer" (Turpin 1827: 310).

Homotypic Synonym(s)
Pleurosigma attenuatum var. scalprum (Gaillon) Cleve
Navicula scalprum Gaillon 1827
Cymbella scalprum (Gaillon) C.Agardh 1830
Sigmatella scalprum (Gaillon) Brébisson 1838
Pleurosigma scalprum (Gaillon) Ralfs 1861
Gyrosigma attenuatum var. scalprum (Gaillon) Cleve 1894

Nomenclatural notes
This combination was first introduced by Sterrenberg (1992: 143) but was invalid at this time as the basionym was incompletely cited; Sterrenberg (2007: 495) validated the name. - (16 Sep 2013) - M.D. Guiry

Taxonomic notes
This species was equated - with some reserve because of its ecology - to the freshwater diatom Gyrosigma acuminatum (Kützing) Rabenhorst by W. Smith in 1852. It has also been ranked (e.g. in the Catalogue of Tempère et Peragallo Ed. 2, slides 143 and 144) as the invalid taxon Gyrosigma hippocampus (Ehrenberg) Hassall. Gy. acuminatum is excluded because it differs in morphology and ecology, Gy. hippocampus is an illegitimate name. - (2 Jul 2011) - M.D. Guiry

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

Description
Valve moderately sigmoid, narrowly lanceolate, gradually tapering to acutely rounded ends, 90-150µm long, 18-22µm wide. Raphe sternum with single curvature, raphe angle +8 to + 11°, straight in the middle portion, gently curving and becoming eccentric near the apex. Central raphe fissures only just extending into the central area, crook-shaped and dimorphic (oppositely deflected to either the convexity or concavity of their raphe branch on the two valves of a frustule). Central area elliptic, symmetric. Terminal areas wide, occupying the entire apex of the valve, with an isolated apical row of minute foramina, at the limit of visibility in the LM. Striae transverse 18-20 in 10µm, longitudinal clearly coarser, 16-18 in 10µm.

Habitat
A marine and estuarine species fairly frequently growing, sometimes as large populations, on marine mudflats and in saltmarshes. So far personally (Sterrenburg) observed on British, French, Dutch, German and Mauritanian (Banc d'Arguin) shores.

Detailed distribution with sources (Click to Load)

Key references
Sterrenburg, F.A.S. (1992). Studies on the genera Gyrosigma and Pleurosigma (Bacillariophyceae). The type of the genus Gyrosigma and the other attenuati sensu Peragallo. Diatom Research 7(1): 137-155.

Created: 26 April 2002 by M.D. Guiry

Verified by: 02 July 2011 by M.D. Guiry

Accesses: This record has been accessed by users 936 times since it was created.

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

Sterrenburg, F.A.S. (2007). Basionym of Gyrosigma scalprum. Diatom Research 22(2): 495.

Linking to this page: http://www.algaebase.org/search/species/detail/?species_id=43981

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 13 November 2018.

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