Taxon Account

Achnanthidium minutissimum (Kützing) Czarnecki; 1994; 157

Synonymy

Achnanthes minutissima Kützing 1833

Key references

Novais M.H., Jüttner I., Van de Vijver B., Morais M.M., Hoffmann L., Ector L. 2015. Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal. Phytotaxa. 224(2): 101-139.

Morphology

Size
5-20 µm long (UK populations), 8.8-17.4 µm (type population);
3-4 µm wide (UK populations), 2.2-4.1 (type population).

Shape
Valve linear-elliptic to linear lanceolate with rostrate to subcapitate poles, frustules rectangular and arched in girdle view, ends not reflexed.

Symmetry
Valves isopolar.

Valve
Frustules heterovalvate, raphe valve concave, rapheless valve convex.

Striae
Striae on both valves just visible and radiate, wider spaced in the valve centre, density 28-32 in 10 µm (UK populations).

Axial area
Raphe valve with narrow linear axial area, rapheless valve with narrow linear axial area slightly widening towards the centre.

Central area
Raphe valve with variable central area, from almost absent, slightly rounded, to rarely a rectangular fascia.
Rapheless valve with almost absent or slightly elliptical central area.

Raphe
A straight filiform raphe present on one valve, externally with slightly expanded straight proximal pores; distal raphe fissure straight or very lightly deflected.

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; Taxonomy; Description; Type Illustration
Lange-Bertalot H., Krammer K. 1989. Achnanthes eine Monographie der Gattung mit Definition der Gattung Cocconeis und Nachträgen zu den Naviculaceae. Bibliotheca Diatomologica Vol. 18. 393 pp; 100 pls Morphology; Type Illustration
Czarnecki D.B. 1994. The freshwater diatom culture collection at Loras College, Dubuque, Iowa. In: J.P. Kociolek (ed.), Proceedings of the 11th International Diatom Symposium, San Francisco, 12-17 August 1990. Memoirs of the California Academy of Sciences no. 17. 155-174. Taxonomy; Morphology
Krammer K., Lange-Bertalot H. 2004. Süßwasserflora Mitteleuropas. Bacillariophyceae. 4. Teil. Achnanthaceae. Kritische Ergänzungen zu Achnanthes s.l., Navicula s.str., Gomphonema. Eds Ettl H., Gärtner G., Heynig H., Mollenhauer D., Gustav Fischer Verlag, Stuttgart. 468 pp Morphology; Type Illustration
Potapova M., Hamilton P. B. 2007. Morphological and ecological variation within the Achnanthidium minutissimum (Bacillariophyceae) species complex. Journal of Phycology. 43: 561-575. Morphology; Type Illustration; Ecology
Wojtal A.Z., Ector L., Van de Vijver B., Morales E.A., Blanco S., Piatek J., Smieja A. 2011. The Achnanthidium minutissimum complex (Bacillariophyceae) in southern Poland. Algological Studies. 136/137: 167-191. Morphology; Illustrations
Novais M.H., Jüttner I., Van de Vijver B., Morais M.M., Hoffmann L., Ector L. 2015. Morphological variability within the Achnanthidium minutissimum species complex (Bacillariophyta): comparison between the type material of Achnanthes minutissima and related taxa, and new freshwater Achnanthidium species from Portugal. Phytotaxa. 224(2): 101-139. Morphology; Taxonomy; Type Illustration;

Similar Species

Similar species not published on this website:

Achnanthidium acsiae Wojtal, E.Morales, Van de Vijver, & Ector; 2011; 226,227

Achnanthidium dolomiticum M.Cantonati & H.Lange-Bertalot; 2006; 1185

Achnanthidium duriense Novais & Ector; 2015; 122,123

Achnanthidium jackii Rabenhorst; 1861; n° 1003

Achnanthidium lusitanicum Novais & M.Morais; 2015; 129

Achnanthidium microcephalum Kützing; 1844; 75

Achnanthidium polonicum Van de Vijver, Wojtal, E.Morales & Ector; 2011; 223

This page should be cited as:

Cox E. J., Williams D. M., Mann D. G., Jüttner I. Achnanthidium minutissimum (Kützing) Czarnecki; 1994; 157. 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=2371. [Accessed:  ].

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Record last modified: 27/12/2020