Taxon Account

Cocconeis neothumensis Krammer; 1990; 151, 152

Key references

Krammer K. 1990. Zur Identität von Cocconeis diminuta Pantocsek und Cocconeis thumensis A. Mayer. In: Ricard M. Coste M. (eds) Ouvrage dédié à la Mémoire du Professeur Henry Germain (1903-1989). 148-156. Koeltz Scientific Books, Koenigstein,.

Morphology

Size
4.8-10 µm long, 3.6-6.3 µm wide (UK population); 6.5-13 µm long, 4-8.3 µm wide (Krammer 1990).

Shape
Valves elliptic with broadly rounded or obtusely pointed ends.

Symmetry
Valves isopolar, bilaterally symmetrical.

Striae
On raphe valve striae slightly radiate to radiate, interrupted towards valve margin by narrow hyaline area, areolae not discernable, 28-36 in 10 µm. On rapheless valve striae slightly radiate to radiate, slightly curved towards valve ends, comprising round areolae, 18-25 in 10 µm (Krammer 1990).

Axial area
Narrow, linear on both valves.

Central area
On raphe valve indistinct, or hardly widened, small round; on rapheless valve indistinct.

Raphe
Straight with small, rounded central pores positioned close to each other, and tear drop-shaped distal ends (SEM).

Literature

References are given in chronological order.

Reference
Citation
Krammer K. 1990. Zur Identität von Cocconeis diminuta Pantocsek und Cocconeis thumensis A. Mayer. In: Ricard M. Coste M. (eds) Ouvrage dédié à la Mémoire du Professeur Henry Germain (1903-1989). 148-156. Koeltz Scientific Books, Koenigstein,. Morphology; Taxonomy; Description; Type Illustration;
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
Ector L., Wetzel C.E., Novais M.H., Guillard D. 2015. Atlas des diatomées des rivières des Pays de la Loire et de la Bretagne. DREAL Pays de la Loire, Nantes. 649 pp Morphology; Illustrations
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
Costa L.F., Wetzel C.E., Ector L., Bicudo D.C. 2019. Freshwater Cocconeis species (Bacillariophyceae) from southeastern Brazil, and the description of C. amerieuglypta sp. nov. Botany Letters. 167(1): 15-31. Morphology; Illustrations; Ecology
Buczkó K., Ács É., Báldi K., Pozderka V., Braun M., Kiss K.T., Korponai J. 2019. The first high resolution diatom record from Lake Balaton, Hungary in Central Europe. Limnetica. 38(1): 417-430. Ecology
This page should be cited as:

Jüttner I., Wetzel C.E., Williams D.M., Van de Vijver B. Cocconeis neothumensis Krammer; 1990; 151, 152. 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=4719. [Accessed:  ].

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Record last modified: 21/10/2022