Taxon Account

Psammothidium marginulatum (Grunow) Bukhtiyarova et Round; 1996; 5


Achnanthes marginulata Grunow in Cleve & Grunow 1880

Key references


Valves elliptic or elliptic-lanceolate with broadly rounded ends.

Isopolar, bilaterally symmetrical, heterovalvar.

Radiate on raphe and rapheless valve.

Axial area
Linear, widening towards the central area.

Central area
On the raphe valve rhombic, ca. 3/4 of the valve width, bordered by several shorter striae, on the rapheless valve large, rhombic extending to the valve ends.

Straight, hardly expanded at the proximal and very slightly expanded at the distal ends.

SEM morphology
Uniseriate striae with round external areola openings on the raphe valve and round or transapically elongated external areola openings on the rapheless valve, internal areola openings occluded by cribra.


References are given in chronological order.

Cleve P.T., Grunow A. 1880. Beiträge zur Kenntniss der Arctischen Diatomeen. Kongliga Svenska-Vetenskaps-Akademiens Handlingar. 17(2): 121 pp.; 7 pls. Description; Morphology
Flower R. J., Jones V. J. 1989. Taxonomic descriptions and occurrences of new Achnanthes taxa in acid lakes in the UK. Diatom Research. 4(2): 227-239. Morphology; Illustrations
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; Type Illustration
This page should be cited as:

Jüttner I. Psammothidium marginulatum (Grunow) Bukhtiyarova et Round; 1996; 5. In: Jüttner I., Carter C., Cox E.J., Ector L., Jones V., Kelly M.G., Kennedy B., Mann D.G., Turner J. A., Van de Vijver B., Wetzel C.E., Williams D.M.. Freshwater Diatom Flora of Britain and Ireland. Amgueddfa Cymru - National Museum Wales. Available online at [Accessed:  ].

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Record last modified: 27/12/2020