Gyrosigma limosum Sterrenburg & Underwood 1997
Current name:
Gyrosigma limosum Sterrenburg & Underwood
SEM apex ext - 14 September 2011. 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)
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.
Created: 25 March 2010 by G.M. Guiry.
Last updated: 22 January 2021
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Linking to this page: https://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. 22 January 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 25 April 2024
