Taxon Account

Cocconeis lineata Ehrenberg; 1849; 301


Cocconeis placentula var. lineata (Ehrenberg) Van Heurck 1995

Key references

Romero O.E., Jahn R. 2013. Typification of Cocconeis lineata and Cocconeis euglypta (Bacillariophyta). Diatom Research. 28(2): 175-184.


Elliptic with obtuse point particularly on raphe valve, raphe valve concave, rapheless valve convex, flexed in girdle view.

Valves isopolar, bilaterally symmetrical.

Frustules heterovalvar.

On raphe valve striae comprising dot-like areolae, slightly radiate in the valve centre, becoming more radiate towards the valve ends. Striae on the raphe valve are interrupted towards the margin by a raised siliceous rim; striae on the rapheless valves do not form distinct longitudinal lines.

Axial area
On raphe valve narrow linear, straight, terminating at marginal ridge; on rapheless valve narrow pore-free area.

Central area
On raphe valve very small and circular or indistinct; absent on rapheless valve.

Straight with expanded proximal and distal ends, proximal ends positioned close together; terminal ends straight, ending at ridge. Internally proximal raphe ends deflected in opposite directions.


References are given in chronological order.

Ehrenberg C.G. 1849. Passatstaub und Blutregen. Ein grosses organisches unsichtbares Wirken und Leben in der Atmospäre. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin 1847. 279-460 pp Morphology; Illustrations
Monnier O., Rimet F., Bey M., Chavaux R., Ector L. 2007. Sur l’identité de Cocconeis euglypta Ehrenberg 1854 et C. lineata Ehrenberg 1843 – Une approche par les sources historiques. Diatomania. 11: 30-45. Morphology; Ecology; Illustrations
Romero O.E., Jahn R. 2013. Typification of Cocconeis lineata and Cocconeis euglypta (Bacillariophyta). Diatom Research. 28(2): 175-184. Morphology; Taxonomy; Description; Type Illustration

Similar Species

Similar species not published on this website:

This page should be cited as:

Jüttner I. Cocconeis lineata Ehrenberg; 1849; 301. 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 [Accessed:  ].

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Record last modified: 27/12/2020