Taxon Account

Encyonema Kützing; 1833; 589

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

Krammer K. 1997. Die cymbelloiden Diatomeen - Eine Monographie der weltweit bekannten Taxa. Teil 1. Allgemeines und Encyonema Part. Bibliotheca Diatomologica, Vol. 36, J. Cramer, Berlin. 382 pp

Morphology

Valves dorsiventral, with a convex dorsal margin, the ventral margin straight, sometimes gibbous or rarely convex, apices rounded or protracted, valves symmetrical to the transapical axis; frustules rectangular or slightly biconvex in girdle view.

Striae uniseriate, areolae often resolvable in LM, often with apically elongated external areolae openings (SEM), internally areolae open in depressions between virgae, often with short struts overlying the vimines, no hymenes or cribra. Stigmoids may be present at proximal end of central ventral striae near the raphe endings.

Raphe usually closer to the ventral margin, more or less straight, proximal endings slightly deflected to dorsal side, distal endings curved to ventral side, internally proximal raphe fissures deflected to dorsal side, iIntermissio present.

No apical pore fields; cells can live in mucilage tubes.

Chloroplast a single double H with a central pyrenoid, lying on the ventral side of the girdle.

Literature

References are given in chronological order.

Reference
Citation
Kützing F.T. 1833. Synopsis Diatomacearum oder Versuch einer systematischen Zusammenstellung der Diatomeen. Linnaea 8(5). 529-620 pp; XIII-XIX pls. Morphology; Description; Illustrations
Round F.E., Crawford R.M., Mann D.G. 1990. The Diatoms. Biology & Morphology of the Genera. Cambridge University Press, Cambridge. 747 pp Morphology; Taxonomy
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; Illustrations; Taxonomy
Krammer K. 1997. Die cymbelloiden Diatomeen - Eine Monographie der weltweit bekannten Taxa. Teil 1. Allgemeines und Encyonema Part. Bibliotheca Diatomologica, Vol. 36, J. Cramer, Berlin. 382 pp Morphology; Taxonomy; Illustrations;
Metzeltin D., Lange-Bertalot H. 2007. Tropical diatoms of South America II. Special remarks on biogeography disjunction. Iconographia Diatomologica, Vol. 18., Annotated Diatom Micrographs. Diversity-Taxonomy-Biogeography. H. Lange-Bertalot (ed.), A.R.G. Gantner Verlag K.G. 877 pp Morphology
This page should be cited as:

Mann D. G., Jüttner I. Encyonema Kützing; 1833; 589. 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=3615. [Accessed:  ].

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Record last modified: 27/12/2020