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Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross

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 euhippus F.A.S.Sterrenburg & R.Ross
survey. 09 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross
survey, small specimen. 09 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross
survey, large specimen. 09 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross
SEM. Centre int. 09 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross
SEM. Centre ext. 09 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross
SEM. Apex int. 09 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross
SEM. Apex ext. 09 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross
details of centre. 09 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross
details of apex. 09 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

 

Laminaria digitata var. ensifolia (Kützing) J.Agardh

Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross SEM. Apex ext
© F.A.S. Sterrenburg

Publication details
Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross in F.A.S.Sterrenburg 1992: 139

Published in: 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.

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.

Nomenclatural notes
Priority for Gyrosigma hippocampus Hassall 1845 - (9 Jul 2011) - M.D. Guiry

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

Description
Valve moderately sigmoid, slender lanceolate, sometimes with a (freely variable!) kink, gradually tapering with acutely rounded ends and markedly vaulted, 120-250µm long, 22-27µm wide. Raphe sternum with single curvature, raphe angle +6 to +9°, middle portion nearly straight, nearly central throughout. Central raphe fissures clear, projecting far into the central area, ending as rounded hooks and dimorphic (oppositely deflected to either the convexity or concavity of their raphe branch on the two valves of a frustule). Central area slender, oval, symmetric. Terminal areas unilaterally dilated funnels in semilateral position. On the convex side of the apical raphe sternum the areolae run for some distance along the apex, paralleled at the periphery by an apical row of minute foramina in a narrow hyaline zone, just visible in the LM. Transverse striae 14-17 in 10µm, the central dozen or so somewhat radiate, longitudinal striae clearly coarser, 10-12 in 10µm medially, abruptly closer near the margin.

Habitat
Marine littoral species, personally observed (Sterrenburg) on Dutch, British and German North Sea coasts.

Key characteristics
Differentiation from G. scalprum: much coarser longitudinal striae, central raphe fissures projecting much further into the central area, totally different apical micropore segment.

Detailed distribution with sources (Click to Load)

Created: 26 April 2002 by M.D. Guiry

Verified by: 09 July 2011 by M.D. Guiry

Accesses: This record has been accessed by users 1092 times since it was created.

Verification of data
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Linking to this page: http://www.algaebase.org/search/species/detail/?species_id=43972

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 19 October 2018.

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