Gomphonema sarcophagus Gregory; 1856; 13
Key references
Reichardt E. 1999. Zur Revision der Gattung Gomphonema. Die Arten um G. affine/insigne, G. angustatum/micropus, G. acuminatum sowie gomphonemoide Diatomeen aus dem Oberoligozän in Böhmen. Iconographia Diatomologica, Vol. 8, Koeltz Scientific Books, A.R.G. Gantner Verlag, Ruggell. 203 pp
Levkov Z., Mitic-Kopanja D., Reichardt E. 2016. The diatom genus Gomphonema from the Republic of Macedonia. Lange-Bertalot H. (ed.) Diatoms of Europe, Vol. 8, Koeltz Botanical Books, Oberreifenberg. 552 pp
Morphology
Size
20.5-31.5 µm long; 5.5-7.0 µm wide (UK population, Pitsford Water), 25-38 µm long, 6-7 µm wide (type population, Loch Leven, see Reichardt 1999), 21-43 µm long, 5.5-7.8 µm wide (European populations, Reichardt 1999, Levkov et al. 2016).
Shape
Valves clavate with rostrate poles, blunt or rounded head pole, rounded foot pole; valve outline sometimes slightly irregular, valve margins can be more or less parallel in the central part of the valve and then taper more abruptly towards the poles than in valves with convex margins which taper more gradually towards the poles.
Symmetry
Heteropolar, bilaterally symmetrical or slightly asymmetrical.
Striae
Slightly radiate in the valve centre, becoming radiate towards the poles, some striae curved, 7-13 in 10 m (UK population), 6-14 (European populations, Reichardt 1999); ‘Janus cells’ (cells with two morphologically distinct valves) present.
Axial area
Narrow, linear.
Central area
Asymmetric, rectangular or slightly acute-angled, with one very short stria on one side, one stigma and a slightly shortened stria on the opposite side.
Raphe
Undulate, expanded proximal ends.
20.5-31.5 µm long; 5.5-7.0 µm wide (UK population, Pitsford Water), 25-38 µm long, 6-7 µm wide (type population, Loch Leven, see Reichardt 1999), 21-43 µm long, 5.5-7.8 µm wide (European populations, Reichardt 1999, Levkov et al. 2016).
Shape
Valves clavate with rostrate poles, blunt or rounded head pole, rounded foot pole; valve outline sometimes slightly irregular, valve margins can be more or less parallel in the central part of the valve and then taper more abruptly towards the poles than in valves with convex margins which taper more gradually towards the poles.
Symmetry
Heteropolar, bilaterally symmetrical or slightly asymmetrical.
Striae
Slightly radiate in the valve centre, becoming radiate towards the poles, some striae curved, 7-13 in 10 m (UK population), 6-14 (European populations, Reichardt 1999); ‘Janus cells’ (cells with two morphologically distinct valves) present.
Axial area
Narrow, linear.
Central area
Asymmetric, rectangular or slightly acute-angled, with one very short stria on one side, one stigma and a slightly shortened stria on the opposite side.
Raphe
Undulate, expanded proximal ends.
Literature
References are given in chronological order.
Reference |
Citation |
|---|---|
| Gregory W. 1856. Notice of some new species of British fresh-water Diatomaceae. Quarterly Journal of Microscopical Science. 4: 1-14. | Morphology; Taxonomy; Illustrations |
| Van Heurck H. 1880. Synopsis des Diatomées de Belgique. Atlas. Ducaju & Cie., Anvers.; 1-30 pls | Illustrations |
| Libsey L.L. 1985. A reconsideration of Gomphonema angustatum var. sarcophagus (Greg.) Grun. Rhodora. 87(No. 852): 555-558. | Taxonomy |
| McBride S.A., Edgar R.K. 1998. Janus cells unveiled: frustular morphometric variability in Gomphonema angustatum. Diatom Research. 13(2): 293-310. | Illustrations; Morphology |
| Reichardt E. 1999. Zur Revision der Gattung Gomphonema. Die Arten um G. affine/insigne, G. angustatum/micropus, G. acuminatum sowie gomphonemoide Diatomeen aus dem Oberoligozän in Böhmen. Iconographia Diatomologica, Vol. 8, Koeltz Scientific Books, A.R.G. Gantner Verlag, Ruggell. 203 pp | Morphology; Type Illustration |
| Wojtal A. 2003. Diatoms of the genus Gomphonema Ehr. (Bacillariophyceae) from a karstic stream in the Krakowsko-Częstochowska Upland. Acta Societatis Botanicorum Poloniae. 72(3): 213-220. | Morphology; Illustrations |
| Levkov Z., Mitic-Kopanja D., Reichardt E. 2016. The diatom genus Gomphonema from the Republic of Macedonia. Lange-Bertalot H. (ed.) Diatoms of Europe, Vol. 8, Koeltz Botanical Books, Oberreifenberg. 552 pp | Morphology; Illustrations; |
This page should be cited as:
Kelly M., Jüttner I., Jones V., Carter C. F. Gomphonema sarcophagus Gregory; 1856; 13. 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=4404. [Accessed:
].
Image Gallery
Record last modified: 27/12/2020