Cymbella proxima Reimer; 1975; 61

Key references

Patrick R.M., Reimer C.W. 1975. The Diatoms of the United States Exclusive of Alaska and Hawaii. Volume 2. Part 2. Entomoneidaceae, Cymbellaceae, Gomphonemaceae, Epithemiaceae. Monographs of the Academy of Natural Sciences of Philadelphia. 13: 213 pp.; 28 pls.

Morphology

Size
38-120 µm long, 18-24 µm wide (Lange-Bertalot et al. 2017).

Shape
Valves with strongly convex dorsal margin, slightly concave ventral margin, except for slightly tumid central section. Valve ends broadly rounded and slightly protracted.

Symmetry
Dorsiventral, isopolar.

Striae
Striae radiate, some striae slightly curved, 7-11 in 10 µm; areolae visible in LM, 12-18 in 10 µm (Lange-Bertalot et al. 2017).

Axial area
Narrow, linear, approximately in centre of valve.

Central area
Round, approximately 1/3 of valve width.

Raphe
Raphe lateral becoming filiform near proximal and distal ends, proximal ends expanded, drop-shaped, straight or slightly ventrally deflected, dorsally deflected terminal fissures.

Other features
3-4 (UK population), 2-5 (Krammer 2002), stigmata on ventral side of central nodule.

Literature

References are given in chronological order.

Reference	Citation
Patrick R.M., Reimer C.W. 1975. The Diatoms of the United States Exclusive of Alaska and Hawaii. Volume 2. Part 2. Entomoneidaceae, Cymbellaceae, Gomphonemaceae, Epithemiaceae. Monographs of the Academy of Natural Sciences of Philadelphia. 13: 213 pp.; 28 pls.	Morphology; Description; Type Illustration; Taxonomy
Krammer K. 1982. Valve Morphology in the Genus Cymbella C.A. Agardh. Helmcke J.-G. & Krammer K. Micromorphology of Diatom Valves. Vol. XI, J. Cramer, Vaduz. 1-49 pp	Morphology; Illustrations
Krammer K. 2002. Cymbella. Lange-Bertalot H. (ed), Diatoms of Europe, Diatoms of the European Inland Waters and Comparable Habitats, Vol.3, A.R.G. Gantner Verlag K.G., Ruggell. 584 pp	Morphology; Illustrations
Siver P.A., Hamilton P.B., Stachura-Suchoples K., Kociolek J.P. 2005. Diatoms of North America: The Freshwater Flora of Cape Cod, Massachusetts, U.S.A.. Ruggell, A.R.G. Gantner Verlag. 463 pp	Morphology; Illustrations
Bruder K., Medlin L.K. 2008. Morphological and molecular investigations of naviculoid diatoms. II. Selected genera and families. Diatom Research. 23(2): 283-329.	Morphology; Biology
Kermarrec L., Ector L., Bouchez A., Rimet F., Hoffmann L. 2011. A preliminary phylogenetic analysis of the Cymbellales based on 18S rDNA gene sequencing. Diatom Research. 26(3): 305-315.	Biology
Lee J.H. 2011. Algal Flora of Korea Vol. 3, No. 4. National Institute of Biological Resources, Seo-gu Incheon. 70 pp	Morphology; Ecology; Illustrations
Potapova M. 2014. Diatoms of Bering Island, Kamchatka, Russia. Nova Hedwigia, Beiheft. 143: 63-102.	Illustrations
Bahls L., Boynton B., Johnston B. 2018. Atlas of diatoms (Bacillariophyta) from diverse habitats in remote regions of western Canada. Phytokeys. 105: 1-186.	Morphology; Ecology; Illustrations
Genkal S.I., Shcherbak V.I., Semenyuk N.Ye. 2020. Morphological variability of some species of the genus Cymbella (Bacillariophyta) from reservoirs of the Dnieper Cascade (Ukraine). International Journal of Algae. 22: 129-136.	Morphology; Illustrations

Similar Species

This page should be cited as:

Jüttner I., Ector L., Wetzel C.E. Cymbella proxima Reimer; 1975; 61. 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. 2025 . Freshwater Diatom Flora of Britain and Ireland. Amgueddfa Cymru - National Museum Wales. Available online at https://naturalhistory.museumwales.ac.uk/diatoms/browsespecies.php?-recid=4633. [Accessed: 2 April 2025].

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Record last modified: 06/12/2022