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Gyrosigma acuminatum (Kützing) Rabenhorst

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 acuminatum (Kützing) Rabenhorst
SEM. 16 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma acuminatum (Kützing) Rabenhorst
SEM. 16 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma acuminatum (Kützing) Rabenhorst
SEM. 16 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma acuminatum (Kützing) Rabenhorst
SEM. 16 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma acuminatum (Kützing) Rabenhorst
SEM. 16 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma acuminatum (Kützing) Rabenhorst
SEM. 16 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma acuminatum (Kützing) Rabenhorst
SEM. 16 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma acuminatum (Kützing) Rabenhorst
SEM. 16 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

Gyrosigma acuminatum (Kützing) Rabenhorst
SEM. 16 Jul 2011. F.A.S. Sterrenburg. © F.A.S. Sterrenburg.

 

Publication details
Gyrosigma acuminatum (Kützing) Rabenhorst 1853: 47, pl. 5: fig. 5a

Published in: Rabenhorst, L. (1853). Die Süsswasser-Diatomaceen (Bacillarien.): für Freunde der Mikroskopie. pp. i-xii, 1-72. Leipzig: Eduard Kummer.
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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
Frustulia acuminata Kützing

Type information
Type locality: süssen Wassern [sweet waters, presumably Germany] (Kützing 1834: 555). Notes: G.C. 14188a, ANSP and BM 78084 (syntype) [Sterrenburg pers.comm.]

Origin of species name
Participle A (Latin), acuminate, i.e. tapering gradually or abruptly from inwardly curved sides into a narrow point (Stearn 1973).

Homotypic Synonym(s)
Frustulia acuminata Kützing 1833
Sigmatella acuminata (Kützing) Brébisson & Godey 1835
Navicula acuminata (Kützing) Kützing 1844
Pleurosigma acuminatum (Kützing) W.Smith 1852

Heterotypic Synonym(s)
Navicula spenceri Bailey ex Quekett 1848
Gyrosigma spenceri (Bailey ex Quekett) Griffith & Henfrey 1856
Gyrosigma spenceri (W.Smith) Griffith & Henfrey 1856
Pleurosigma gracilentum Rabenhorst 1861
Scalptrum spenceri (Quekett) Kuntze 1891

Taxonomic notes
The slender specimens seen in flourishing populations exactly match the type specimens of Gyrosigma spenceri, which is a synonym as far as the non-marine records are concerned. - (16 Jul 2011) -

General environment
This is a freshwater species.

Description
Valve moderately sigmoid, slender to somewhat more broadly lanceolate with fairly obtuse or subacute ends, 70-180 µm long, 12-24 µm wide. Raphe sternum with minimal double curvature, almost straight for half its length, practically median except slightly eccentric near the ends, raphe angle +3 to +8 degrees. Central raphe fissures crook-shaped, oppositely deflected to either the convexity or concavity of their raphe sternum (dimorphic deflection type). Central area oval, not rotated. Terminal areas unilaterally dilated funnels in semilateral position. A crescent of minute apical microforamina runs around the apex in the hyaline terminal area, at the limit of visibility in the LM. Longitudinal striae 19-24 in 10 µm, markedly closer together at the margin of the valve (SEM), transverse almost equally fine or very slightly coarser.

Habitat
Very common in fresh to very slightly brackish waters, probably cosmopolitan and personally (Sterrenburg) observed in samples from Europe, the USA, New Zealand and South Africa.

Detailed distribution with sources (Click to Load)

Key references
Aboal, M., Álvarez Cobelas, M., Cambra, J. & Ector, L. (2003). Floristic list of non-marine diatoms (Bacillariophyceae) of Iberian Peninsula, Balearic Islands and Canary Islands. Updated taxonomy and bibliography. Diatom Monographs 4: 1-639.

Buczkó, K., Ács, É., Báldi, K., Pozderka, V., Braun, M., Kiss, K.T. & Korponai, J. (2019). The first high resolution diatom record from Lake Balaton, Hungary in Central Europe. Limnetica 38(1): 417-430, 4 figs.

Cantonati, M., Kelly, M.G. & Lange-Bertalot, H. (2017). Freshwater benthic diatoms of Central Europe: over 800 common species used in ecological assessments. English edition with updated taxonomy and added species. pp. [1]-942, 135 pls. Schmitten-Oberreifenberg: Koeltz Botanical Books.

Foged, N. (1966). Freshwater diatoms from Ghana. Det Kongelige Danske Videnskabernes Selskab, Biologiske Shrifter 15(1): 1-169, 25 pls.

Hofmann, G., Werum, M. & Lange-Bertalot, H. (2013). Diatomeen im Süßwasser—Benthos von Mitteleuropa. Bestimmungsflora Kieselalgen für die ökologische Praxis. Über 700 der häufigsten Arten und ihre Ökologie. pp. [1]-908, 133 pls. Königstein: Koeltz Scientific Books.

Hu, H. & Wei, Y. (2006). The freshwater algae of China. Systematics, taxonomy and ecology. pp. [4 pls of 16 figs], [i-iv], i-xv, 1-1023. China: www.sciencep.com.

Hustedt, F. (1930). Bacillariophyta (Diatomeae) Zweite Auflage. In: Die Süsswasser-Flora Mitteleuropas. Heft 10. (Pascher, A. Eds), pp. [i]-vii, [1]-466. Jena: Verlag von Gustav Fischer.

John, J. (2018). Diatoms from Tasmania: taxonomy and biogeography. The diatom flora of Australia Volume 2. pp. [1]-656, 351 figs. Schmitten - Oberreifenberg: Koeltz Botanical Books.

Krammer, K. & Lange-Bertalot, H. (1986). Bacillariophyceae 1 Teil: Naviculaceae. In: Süßwasserflora von Mitteleuropa. Begründet von A. Pascher. Herausgegeben von. H. Ettl, J. Gerloff, H. Heynig & D. Mollenhauer. Band 2/1. pp. [i]-xvi, [1]-876, 206 pls with 2976 figures. Stuttgart & New York: Gustav Fischer Verlag.

Pankow, H. (1976). Algenflora der Ostsee. II. Plankton (einschliesslich benthischer Kieselalgen). pp. 1-493, 880 figs, 26 pls. Jena: Gustav Fischer.

Proschkina-Lavrenko, A.I. (1950). Diatomovyi Analiz, Kniga 3. Opredelitel' iskopaemykh i sovremennykh diatomik vodoroslei Poriadok Pennales. Botanicheskii Institut im V.L. Komarova Akademii Nauk S.S.S.R. Gosudarstvennoe Izdatelystvo geologicheskoi Literatury 3(1): [1]-398, 117 pls. [in Russian]

Reichardt, E. (2018). Die Diatomeen im Gebiet der Stadt Treuchtlingen . pp. Band 1 [1]-576; Band 2: 579-1184, incl 451 pls. München: Bayerische Botanische Gesellschaft [Selbstverlag der Gesellschaft].

Sims, P.A. (ed.) (1996). An atlas of British diatoms arranged by B. Hartley based on illustrations by H.G. Barber and J.R. Carter. pp. [2], 1-601, incl. 290 pls. Bristol: Biopress Ltd.

Created: 11 April 2002 by M.D. Guiry

Verified by: 15 March 2019 by M.D. Guiry

Accesses: This record has been accessed by users 7911 times since it was created.

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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. (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.

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Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 2019. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. http://www.algaebase.org; searched on 24 April 2019.

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