Taxon Account

Psammothidium helveticum (Hustedt) Bukhtiyarova & Round; 1996; 8

Synonymy

Achnanthidium helveticum (Hustedt) O. Monnier, H. Lange-Bertalot & L. Ector in Monnier et al. 2007
Achnanthes helvetica (Hustedt) Lange-Bertalot in Lange-Bertalot & Krammer 1989
Achnanthes austriaca var. helvetica Hustedt 1933

Key references

Krammer K., Lange-Bertalot H. 2004. Süßwasserflora Mitteleuropas. Bacillariophyceae. 4. Teil. Achnanthaceae. Kritische Ergänzungen zu Achnanthes s.l., Navicula s.str., Gomphonema. Eds Ettl H., Gärtner G., Heynig H., Mollenhauer D., Gustav Fischer Verlag, Stuttgart. 468 pp

Morphology

Size
10.0-24.0 µm long, 5.0-6.5 µm wide (UK population).

Shape
Valves elliptic with broadly rounded ends.

Symmetry
Isopolar, bilaterally symmetrical, heterovalvar.

Striae
Striae radiate on both valves; areolae sometimes discernible, 24-28 in 10 µm (UK population).

Axial area
Narrow, linear, slightly widening towards central area.

Central area
On raphe valve a large irregular, oval, rectangular or acute-angled sub-fascia occupying more than half the valve width, bordered by several short striae, sometimes central area extends to valve margin; on rapheless valve rounded central area occupying ca. half the valve width.

Raphe
Raphe straight with expanded proximal ends, distal raphe fissures curved in opposite directions.

Literature

References are given in chronological order.

Reference
Citation
Hustedt F. 1933. Die Kieselalgen Deutschlands, Österreichs und der Schweiz unter Berücksichtigung der übrigen Länder Europas sowie der angrenzenden Meeresgebiete. 7 (Teil 2, Lief. 3). In: L. Rabenhorst (ed.), Kryptogamen Flora von Deutschland, Österreich und der Schweiz. Akademische Verlagsgesellschaft m.b.h., Leipzig. 321-433 pp; 781-880 pls. Morphology; Description; Illustrations
Simonsen R. 1987. Atlas and Catalogue of the Diatom Types of Friedrich Hustedt. J. Cramer in der Gebrüder Borntraeger Verlagsbuchhandlung, Berlin, Stuttgart. Type Illustration; Morphology
Lange-Bertalot H., Krammer K. 1989. Achnanthes eine Monographie der Gattung mit Definition der Gattung Cocconeis und Nachträgen zu den Naviculaceae. Bibliotheca Diatomologica Vol. 18. 393 pp; 100 pls Morphology; Taxonomy; Type Illustration
Bukhtiyarova L., Round F.E. 1996. Revision of the genus Achnanthes sensu lato. Psammothidium, a new genus based on A. marginulatum. Diatom Research. 11(1): 1-30. Morphology; Taxonomy
Krammer K., Lange-Bertalot H. 2004. Süßwasserflora Mitteleuropas. Bacillariophyceae. 4. Teil. Achnanthaceae. Kritische Ergänzungen zu Achnanthes s.l., Navicula s.str., Gomphonema. Eds Ettl H., Gärtner G., Heynig H., Mollenhauer D., Gustav Fischer Verlag, Stuttgart. 468 pp Morphology; Type Illustration; Ecology
Manoylov K.M. 2007. On some Psammothidium species from rivers in the United States. Diatom Research. 22(2): 317-327. Morphology; Illustrations
Monnier O., Lange-Bertalot H., Hoffmann L., Ector L. 2007. The genera Achnanthidium Kützing and Psammothidium Bukhtiyarova et Round in the family Achnanthidiaceae (Bacillariophyceae): A reappraisal of the differential criteria. Cryptogamie, Algologie. 28(2): 141-158. Morphology; Taxonomy; Illustrations
Peeters V., Ector L. 2018. Atlas des diatomées des cours d'eau du territoire bourguignon. Direction Régionale de l'Environnement, de l'Aménagement et du Logement Bourgogne-Franche-Comté, Dijon. Vol.2: 271 pp. Morphology; Illustrations; Ecology
This page should be cited as:

Jüttner I., Ector L. Psammothidium helveticum (Hustedt) Bukhtiyarova & Round; 1996; 8. In: Jüttner I., Bennion H., Carter C., Cox E.J., Ector L., Flower R., Jones V., Kelly M.G., Mann D.G., Sayer C., Turner J. A., Williams D.M.. Freshwater Diatom Flora of Britain and Ireland. Amgueddfa Cymru - National Museum Wales. Available online at https://naturalhistory.museumwales.ac.uk/diatoms/browsespecies.php?-recid=2362. [Accessed:  ].

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Record last modified: 23/09/2021