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Gyrosigma limosum Sterrenburg & Underwood 1997

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 limosum Sterrenburg & Underwood
SEM survey. 14 Sep 2011. F.A.S Sterrenburg. © F.A.S Sterrenburg.

Gyrosigma limosum Sterrenburg & Underwood
SEM centre int. 14 Sep 2011. F.A.S Sterrenburg. © F.A.S Sterrenburg.

Gyrosigma limosum Sterrenburg & Underwood
SEM centre ext. 14 Sep 2011. F.A.S Sterrenburg. © F.A.S Sterrenburg.

Gyrosigma limosum Sterrenburg & Underwood
SEM apex int. 14 Sep 2011. F.A.S Sterrenburg. © F.A.S Sterrenburg.

Gyrosigma limosum Sterrenburg & Underwood
SEM apex ext. 14 Sep 2011. F.A.S Sterrenburg. © F.A.S Sterrenburg.

Gyrosigma limosum Sterrenburg & Underwood
small. 14 Sep 2011. F.A.S Sterrenburg. © F.A.S Sterrenburg.

Gyrosigma limosum Sterrenburg & Underwood
14 Sep 2011. F.A.S Sterrenburg. © F.A.S Sterrenburg.

 

Gigartina stellata f. acuta (Turner) Batters

Gyrosigma limosum Sterrenburg & Underwood SEM centre int
© F.A.S Sterrenburg

Publication details
Gyrosigma limosum Sterrenburg & Underwood 1997: 167, figs 1-7

Published in: Sterrenburg, F.A.S. & Underwood, G.J.C. (1997). Studies on the genera Gyrosigma and Pleurosigma (Bacillariophyceae). The marine "Gyrosigma spenceri" records: Gyrosigma limosum Sterrenburg et Underwood nov. sp. Proceedings Academy of Natural Sciences of Philadelphia 148: 165-169.

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.

Type information
Type locality: UK: England: Essex: Hythe Marshes, Colne Estuary (Index Nominum Algarum). Type: BM 81868 (Index Nominum Algarum

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

Taxonomic notes
This very common and strictly littoral marine species had been widely misidentified in the literature as "Gy spenceri" (= the strictly non-marine species Gy. acuminatum). - (14 Sep 2011) - M.D. Guiry

General environment
This is a marine species.

Description
Valve slightly sigmoid, linear-lanceolate, with subacute ends, 55-85 µm long, 8.5-12.5 µm wide. Raphe sternum with single curvature, raphe angle +4 to +8°, practically median throughout. Central raphe fissures oppositely deflected dimorphic crooks, difficult to see in LM. Terminal areas very small triangles in semilateral position. A small apical microforamina segment is present at the very tip of the vlave (SEM). Striae transverse 20  24 in 10 µm, longitudinal much finer, 26  29 in 10 µm. One paraxial row of internal areolar foramina displays small hoods; at the valvar margin the striae become condensed (SEM).

Habitat
Common littoral marine species flourishing in very large numbers on salt marshes and mudflats on the coasts of W. Europe and the USA. Probably much more widely distributed.

Similar species
Gy. spenceri sensu Hustedt (1930), van der Werff & Huls (1957  1974) and other authors.

Detailed distribution with sources (Click to Load)

Key references
Thaler, M. & Kaczmarska, I. (2009). Gyrosigma orbitum sp. nov. (Bacillariophyta) from a salt marsh in the Bay of Fundy, eastern Canada. Botanica Marina 52: 60-68.

Created: 25 March 2010 by G.M. Guiry

Verified by: 22 January 2021 by G.M. Guiry

Accesses: This record has been accessed by users 1584 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.)

Sterrenburg, F.A.S. & Underwood, G.J.C. (1997). Studies on the genera Gyrosigma and Pleurosigma (Bacillariophyceae). The marine "Gyrosigma spenceri" records: Gyrosigma limosum Sterrenburg et Underwood nov. sp. Proceedings Academy of Natural Sciences of Philadelphia 148: 165-169.

Linking to this page: http://www.algaebase.org/search/species/detail/?species_id=136645

Citing AlgaeBase
Cite this record as:
G.M. Guiry in Guiry, M.D. & Guiry, G.M. 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 22 October 2021.

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