Taxon Account

Achnanthes coarctata (Brébisson ex W. Smith) Grunow in Cleve & Grunow; 1880; 20

Key references

Tofilovska S., Wetzel C.E., Ector L., Levkov, Z. 2014. Observation on Achnanthes Bory sensu stricto (Bacillariophyceae) from subaerial habitats in Macedonia and comparison with the type material of A. coarctata (Brébisson ex W. Smith) Grunow, A. coarctata var. sinaensis Hustedt and A. intermedia Kützing. Fottea. 14(1): 14-42.

Morphology

Size
Length 17-48 µm, width 6-16 µm (central European population, Hofmann et al. 2011).

Shape
Valves panduriform with a central constriction and broadly rounded, rostrate ends. Frustules in girdle view bent with reflexed ends.

Symmetry
Valves isopolar.

Valve
Frustules heterovalvar with concave raphe valve and convex rapheless valve.

Striae
The uniseriate, punctate striae are radiate from the valve centre, but more strongly radiate near the ends. On the rapheless valve they are more or less parallel at the valve centre.

Axial area
The narrow, linear axial area on the raphe valve is slightly curved. A narrow sternum is located near the margin on the rapheless valve.It can be curved towards the valve centre in the middle part of the valve.

Central area
A broad transverse fascia, which can be asymmetrical, on the raphe valve.

Raphe
Raphe slightly curved with expanded proximal ends.

Literature

References are given in chronological order.

Reference
Citation
Smith W. 1855. Notes of an excursion to the south of France and the Auvergne in Search of Diatomaceae. Annals and Magazine of Natural History, 2nd series. 15: 1-9; pl.1. Description; Illustrations
Cleve P.T., Grunow A. 1880. Beiträge zur Kenntniss der Arctischen Diatomeen. Kongliga Svenska-Vetenskaps-Akademiens Handlingar. 17(2): 121 pp.; 7 pls. Taxonomy
Boyle J.A., Pickett-Heaps J.D., Czarnecki D.B. 1984. Valve morphogenesis in the pennate diatom Achnanthes coarctata. Journal of Phycology. 20: 563–573. Biology; Illustrations; Morphology
Cox E.J. 2006. Achnanthes sensu stricto belongs with genera of the Mastogloiales rather than with other monoraphid diatoms(Bacillariophyta). European Journal of Phycology. 41: 67-81. Morphology; Taxonomy; Illustrations
Tofilovska S., Wetzel C.E., Ector L., Levkov, Z. 2014. Observation on Achnanthes Bory sensu stricto (Bacillariophyceae) from subaerial habitats in Macedonia and comparison with the type material of A. coarctata (Brébisson ex W. Smith) Grunow, A. coarctata var. sinaensis Hustedt and A. intermedia Kützing. Fottea. 14(1): 14-42. Morphology; Illustrations; Type Illustration;
This page should be cited as:

Jüttner I. Achnanthes coarctata (Brébisson ex W. Smith) Grunow in Cleve & Grunow; 1880; 20. 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=4453. [Accessed:  ].

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Record last modified: 27/12/2020