Taxon Account

Encyonema prostratum (Berkeley) Kützing; 1844; 82

Synonymy

Monema prostratum Berkeley 1832
Encyonema paradoxum Kützing 1844
Cymbella prostrata (Berkeley) Cleve 1894

Key references

Krammer K. 1997. Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Teil 2. Encyonema part., Encyonopsis and Cymbellopsis. Bibliotheca Diatomologica, Vol. 37, J. Cramer, Berlin. 469 pp

Morphology

Shape
Valves cymbelloid with convex dorsal margin, very slightly convex ventral margin with more or less inflated central section, and slightly protracted broadly rounded ends.

Symmetry
Dorsiventral.

Striae
Striae slighty radiate, on the ventral side parallel to slightly convergent towards the poles; alternate short and long striae positioned around the poles; areolae are apically elongate (SEM) and clearly visible in LM, striae adjacent to central area terminate sometimes in small round areolae (SEM).

Axial area
Narrow, straight.

Central area
Circular to oval, ca. 1/4 of valve width.

Raphe
Slightly curved, in the central section of the valve with expanded, slightly dorsally bent proximal endings, and short ventrally deflected terminal fissures, terminating in the sometimes slightly expanded distal part of the axial area on the valve face.

Literature

References are given in chronological order.

Reference
Citation
Berkeley M.J. 1833. Gleanings of British Algae. Appendix to the Supplement to English Botany. C.E. Sowerby, London. 50 pp Illustrations; Morphology
Kützing F.T. 1844. Die Kieselschaligen Bacillarien oder Diatomeen. Fr. Fritsch, Nordhausen. 152 pp; 30 pls Morphology; Description; Illustrations
Krammer K. 1997. Die cymbelloiden Diatomeen. Eine Monographie der weltweit bekannten Taxa. Teil 2. Encyonema part., Encyonopsis and Cymbellopsis. Bibliotheca Diatomologica, Vol. 37, J. Cramer, Berlin. 469 pp Morphology; Taxonomy; Illustrations
Silva W.J., Jahn R., Ludwig T.A.V., Menezes M. 2013. Typification of seven species of Encyonema and characterization of Encyonema leibleinii comb. nov. Fottea, Olomouc. 13(2): 119-132. Morphology; Taxonomy; Illustrations
This page should be cited as:

Jüttner I. Encyonema prostratum (Berkeley) Kützing; 1844; 82. 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=3511. [Accessed:  ].

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Record last modified: 27/12/2020