Taxon Account

Encyonopsis minuta Reichardt & Krammer; 1997; 95

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 lanceolate to linear-lanceolate, convex dorsal margin only slightly more curved than the convex ventral margin, sometimes the valves can be almost symmetrical, dorsal and ventral margins taper gradually, near the apices a little more strongly, towards the rostrate to subcapitate apices, apices sometimes slightly deflected towards the ventral side.

Symmetry
Isopolar, dorsiventral, sometimes almost symmetrical.

Striae
Fine but easily resolved, more or less parallel throughout the valve, slightly more radiate near the poles.

Axial area
Very narrow, linear.

Central area
Not wider than the axial area.

Raphe
Filiform, positioned more or less in the centre of the valve or slightly nearer to the dorsal margin, straight to very slightly biarcuate in the central section of the valve, with slightly dorsally deflected proximal endings; central and polar nodules visible; the latter slightly short from the apices, distal raphe fissure deflected ventrally (SEM).

Literature

References are given in chronological order.

Reference
Citation
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; Description; Type Illustration;
Hofmann G., Werum M., Lange-Bertalot H. 2011. Diatomeen im Süßwasser-Benthos von Mitteleuropa. A.R.G. Gantner, Ruggell. 908 pp Morphology; Illustrations
Bahls L.L. 2013. Northwest Diatoms. Encyonopsis from western North America: 31 species from Alberta, Idaho, Montana, Oregon, South Dakota, and Washington, including 17 species described as new. Vol. 5. Loren L. Bahls, Helena. Morphology; Ecology; Illustrations

Similar Species

Similar species not published on this website:

This page should be cited as:

Cox E. J., Jones V., Jüttner I. Encyonopsis minuta Reichardt & Krammer; 1997; 95. In: Jüttner I., Bennion H., Carter C., Cox E.J., Ector L., Flower R., Jones V., Kelly M.G., Mann D.G., Sayer C., Turner J. A., 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=2536. [Accessed:  ].

Image Gallery

Record last modified: 27/12/2020