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.
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
Similar species not published on this website:
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..
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:
].
Image Gallery
Record last modified: 06/12/2022