Taxon Account

Diatoma elongatum (Lyngbye) Agardh; 1824; 4


Diatoma tenue var. elongatum Lyngbye 1819

Key references


Valves linear with rounded ends, sometimes slightly inflated.

Isopolar, bilaterally symmetrical.

Prominent transapical ribs (mostly primary and tertiary).

Very fine, not visible in LM.

Axial area
Very narrow, linear, not visible in LM.

SEM morphology
Uniseriate, parallel striae.

Internally prominent transapical ribs.

One rimoportula positioned close to one of the apical pore fields.


References are given in chronological order.

Agardh, C.A. 1824. Systema Algarum. Adumbravit C.A. Agardh. Lundae Literis Berlingianis. Lundae. xxxvii, 312 pp.. Taxonomy
Cleve-Euler A. 1968. Die Diatomeen von Schweden und Finnland. 5. Bibliotheca Phycologica. Morphology; Ecology
Geitler L. 1971. Über Differenzierung der Kettenkolonien von Diatoma elongatum und vulgare. Österreichische Botanische Zeitschrift. 119: 404-409. Biology
Hartley B., Barber H.G., Carter J.R., Sims P.A. 1996. An Atlas of British Diatoms. Biopress Ltd., Bristol. 601 pp. Illustrations

Similar Species

Similar species not published on this website:

This page should be cited as:

Jüttner I., Williams D. M. Diatoma elongatum (Lyngbye) Agardh; 1824; 4. In: Jüttner I., Carter C., Chudaev D., 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