Taxon Account

Diatoma problematica Lange-Bertalot; 1993; 23

Key references

Lange-Bertalot H. 1993. 85 neue Taxa und über 100 weitere neu definierte Taxa ergänzend zur Süßwasserflora von Mitteleuropa Vol.2/1-4. Bibliotheca Diatomologica 27, J. Cramer, Berlin, Stuttgart. 454 pp

Morphology

Size
20-50 µm long, 5-7 µm wide (UK population).

Shape
Linear, linear-elliptic or elliptic, broadly rounded, subrostrate ends in medium and large-sized valves.

Symmetry
Isopolar, bilaterally symmetrical.

Valve
Prominent transapical ribs (primary and tertiary), 6-9 in 10 µm.

Striae
Very fine, not visible in LM.

Axial area
Narrow, linear.

Other features
Girdle composed of many bands, open at opposite ends of the frustule.


SEM morphology
Striae uniseriate, equidistant throughout the valve face, parallel and slightly radiate near the apical pore fields .

Internally prominent transapical ribs.

One rimoportula positioned close to the apical pore field.

Literature

References are given in chronological order.

Reference
Citation
Lange-Bertalot H. 1993. 85 neue Taxa und über 100 weitere neu definierte Taxa ergänzend zur Süßwasserflora von Mitteleuropa Vol.2/1-4. Bibliotheca Diatomologica 27, J. Cramer, Berlin, Stuttgart. 454 pp Morphology; Taxonomy; Description; Illustrations; Type Illustration
Hofmann G., Werum M., Lange-Bertalot H. 2011. Diatomeen im Süßwasser-Benthos von Mitteleuropa. A.R.G. Gantner, Ruggell. 908 pp Illustrations; Ecology; Morphology
This page should be cited as:

Jüttner I., Williams D. M. Diatoma problematica Lange-Bertalot; 1993; 23. 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 https://naturalhistory.museumwales.ac.uk/diatoms/browsespecies.php?-recid=4099. [Accessed:  ].

Image Gallery

Record last modified: 27/12/2020