Taxon Account

Cocconeis pseudothumensis Reichardt; 1982; 99

Key references

Morphology

Size
9.8-12.4 µm long, 7.4-8.6 µm wide (UK population); 11.5-13.5 µm long, 8,5-9.5 µm wide (Reichardt 1982).

Shape
Valves elliptic with broadly rounded ends.

Symmetry
Valves isopolar, bilaterally symmetrical.

Striae
On raphe valve striae very fine, radiate, hardly discernible in LM, 35-40 in 10 µm (Lange-Bertalot et al. 2017); on rapheless valve striae radiate, composed of 2-4 round areolae, 11-13 in 10 µm (UK population), 10-12 in 10 µm (Reichardt 1982).

Axial area
On raphe valve narrow linear, on rapheless valve wide lanceolate.

Raphe
Raphe straight with central pores positioned close to each other.

Literature

References are given in chronological order.

Reference
Citation
Reichardt E. 1982. Die Diatomeenflora der "Steinernen Rinnen" in Mittelfranken. 53. Berichte der Bayerischen Botanischen Gesellschaft (zur Erforschung der heimischen Flora). 97-112 pp Morphology; Taxonomy; Description; Illustrations
Carter J.R. 1993. Observations on some newly described diatoms in the genus Cocconeis Ehrenberg now found to be members of the British flora. Quekett Journal of Microscopy. 37: 39-41. Morphology; Illustrations
Van Dam H., Mertens A., Sinkeldam J. 1994. A coded checklist and ecological indicator values of freshwater diatoms from the Netherlands. Netherlands Journal of Aquatic Ecology. 28(1): 117-133. Ecology
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
Bey M.-Y., Ector L. 2013. Atlas des diatomées des cours d’eau de la région Rhône-Alpes. Centre de Recherche Public Gabriel Lippmann, Vol. 1-6. Morphology; Illustrations; Ecology
Lange-Bertalot H., Hofmann G., Werum M., Cantonati M. 2017. Freshwater Benthic Diatoms of Central Europe: Over 800 Common Species Used in Ecological Assessment. Cantonati M., Kelly M.G., Lange-Bertalot H. (eds.), Koeltz Botanical Books, Schmitten-Oberreifenberg, Germany. 942 pp Morphology; Illustrations; Ecology
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. Illustrations; Morphology
This page should be cited as:

Jüttner I., Van de Vijver B., Williams D.M. Cocconeis pseudothumensis Reichardt; 1982; 99. 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=3029. [Accessed:  ].

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Record last modified: 20/10/2022